Hi I remember a while back looking around and Taka had put up some information from a japanese magazine rating exhausts out of 4 (4 was presumably the loudest) for noise and fit?
I have been seaching the forums but I cannot find this information, and I am currently considering an exhaust. Can someone point me in the right direction for this info please?
At the moment I am leaning towards the HKS, because I have heard that it is nice and quiet at low revs, almost stock at idle, but above 5G it lights up and howls. This sounds perfect to me, as I like a bit of noise (my old S15 used to scream :D) but I am also worried about cops.
I have heard that the fujitsubo is very quiet, and the mazda speed is very quiet. The greddy is ment to be super loud?
AutoExe is ment to be nice, havn't heard much about it?
The RE-Amemiya (http://www.re-amemiya.co.jp/rx_8/rx_8/s_rx_8_muff.html) I hear is good, as they are solely rotary tuners, but I havn't heard anything about how loud it is, and I don't know if I like the downturned tips.
I am really only looking at JDM parts as I can easily get them.
Any advice from anyone or anythign anyone has to add?

Have you heard the Hymee exhaust?

No I havn't.
I don't know if he sends them over the ditch, but if so I would appreciate a price quote if he happens to see this thread. I know I have seen prices before, but I don't think he has them on his website, and I would need to know how much shipping would be as well.
A lot of people seem happy with the Hymee exhaust, but to me its kind of an unknown factor, something to think about but like I said above I am really looking at JDM ones first and foremost.

DCD,

That information, is a guide (correct me if i'm wrong Taka).....but that info is a guide from Japan's Hyper REV "RX8" Edition.

What that is is a bit like "HOT4's" or "fast fours and rotaries" magazine.....except the magazine is purely 100% dedicated to "RX8".

The magazine brings out all types of part listings, and in the instance of exhaust, classes the parts sound in a rating. Another example is that it tests out many "spring" manufacturer, and rates whether the spring is a better addition for road or track......

it's issue 96, I have it home, n-e way... here is a brief link...

http://japanbookplaza.com.au/shop/product_info.php/products_id/21983

I am flattered. This is the first post that someone name the thread after me and seeking info :cool: and :embrassed:

I did talk about it. I think it is in the Hymee exhaust thread somewhere. I will go home tonight to list all the horse power and sound loudness from the HyperRev Magazine if you like. You have heard my Fuji from the video I took with the crappy Sony P10?

By your discription of the HKS and the way you like it, you have to hear Hymee before put your money for HKS. But how do we do that in NZ?

DCD,

The exhaust you are after is exactly what Hymees exhaust provides. Unless you want to pay too much for other exhaust systems that don't give you any additional benefits then HYMEES exhaust is the one to go for!

Hymee's website address is below so if you contact him I am sure he will be only too pleased to provide you a quote.
http://www.hymee.com/rx8

Cheers,

Joe

Wow that book looks neat, man I wish I could read japanese! It looks like something that every RX8 owner should take a look at, at least once or twice.
Taka, yeah I have heard that clip from of your car its hard to hear though, a lot of wind noise. What we need is like a clip I saw of M3's exhaust, where they have 5-6 diff M3's, and on the same day, they line the cars up one by one, and get them to rev to about 6G then they drive off, pushing to redline in first two gears. It gives a great indication of the differnt exhausts and the best thing is they are all doing the same thing, so you can compare!
Its hard because most of the RX8 exhaust clips I have heard you don't actually know what people are doing in them.

Oh and Taka thanks, I would very much appreciate any info you can give me on the different exhausts. That would be great!

Well yeah if anyone has any comments on the different JDM exhasuts please keep them coming, it would be great if someone here has actually heard a hymee and a HKS and can offer a comparison?

And on that I'm off to give Hymee and email :D

I've got a HKS on my 8, while 8ABY8 has got a Hymee on his.
Both are two different styles of exhausts which are difficult to compare.
One man's cup of Earl Grey may not be another man's Jasmine (tea, that is). :)
A few of the guys who attended the meet on monday night may be able to give you their opinions since there was Hymee, HKS and Ric Shaw exhausts present and we conducted somewhat of a "soundoff".
The HKS was not what I expected when I ordered it since it is loud and brash, but over time I have learned to love it since it suits my personality. :)

So nojooc you have the HKS? You say its loud and brash, is it super loud all the time, or is is fairly quiet unless you really get on it? Basically I like a nice loud exhaust, but I'm worried about undue attention from the boys in blue.

What kind of loud is it? Is it like a buzzsaw? A deep tone, or very high pitched? I know its hard to describe sounds, but anything you can tell me would help greatly!

Over here if your exhaust is too loud its at the warrent issuers discretion to state your car unroadworthy, so I don't wanna drop $2000 on an exhaust and have it pinged by some fool in a warrent shop. As long as the car is reasonable sounding they are ok though.

Normal at idle
Barely noticeable at 5000rpm
Angry at 6000rpm
Ballistic at 9000rpm

daz1300 seems to have fallen in love with my HKS following monday night's meet.
He describes it as "ssssswwweeeeetttt" or something to that effect. :)

Sorry, forgot to mention that its "deep" and "bassy" with a hint of metallic "raspiness".

Mmmmmm I'm falling in love with the description, that sounds PERFECT. I want somehting thats not gonna be intrusive, unless I want it to be, and that sounds like it was made just like that. Does it drone at all, when you are on the motorways etc? I drive a lot of motorway to work everyday so this is kinda important too.

Over here the exhaust testing is done something like unloaded at 3000rpm. So it should be pretty sweet with regard to the fuzz etc..

No drone on the freeway whatsoever. at least inside the cabin that is.
Although you'll find yourself purposely dropping down gears to keep the revs up so you can enjoy the "twin-rotor symphony." LOL :)

I had the pleasure of a ride in Hymee's car last week. His exhaust is very well behaved when you're taking it easy - it's barely louder than stock when you're light on the throttle and is hard to hear with the air conditioning going on full. When you open it up a bit, that's when it kicks in and it's a much "meatier" sound than stock - deeper and louder so you can hear what's going on - much more like what a sports car should sound like rather than the stock "vacuum cleaner on steroids" sound.

Sound files are here: http://www.rx8club.com/showpost.php?p=249619&postcount=72

The Racing Beat exhaust is awesome (bolts straight on). But the fuel economy has degraded somewhat since I installed it cause to hear it is to give it ;-)

AMEN Z88M! I just didn't want to be the first to mention the Racing Beat Exhaust, but I agree with you totally on the fuel consumption issue.............to drive it hard is to hear it the way God intended it! (Add the Racing Beat Air Filter and Fly Wheel and hang on!!!!!!!!!!!!!!!!!!!!!!!!) :D

Emack,

You seem to have a fair few Racing Beat bits on your 8. Where'd you get them from?
Were they ordered directly from the States or have you got a supplier down under?

From RB direct in the States.

Yeah I have heard that a lot of members are happy with the Racing Beat, and various American manufactured products. However like I stated I would much prefer to get a JDM product as I have a guy that a know well, and have been a customer with for a long time. He deals primarily in JDM stuff, and I trust him and for issues with a product such as warrenty it is so much easier when there is someone you can talk to face to face, rather than trying to sort things out from NZ to america.

So I take it you decided against the M3....?!

Oh yeah the thing with the M3 fell through. I drove the car for a weekend, and the SMG wasn't really my thing. It was a wicked car and had it been manual I think I would have definatly gone for it. So I was undecided and then they magaged to find a dealership that would give them a halfway decent price for it.
So no M3 for me, but the RX is still a great car, I wasn't too worried to keep it in the end! Also I have been driving a station wagon recently so when I get into the RX its fantastic! And since I am keeping it, I think I will now keep it for a fair while and do a few things to it. There are no other "great deals" that I can see that can possibly come up, so I think its definatly time to put my mark on my car.

Sorry about the delay reply. Here it is ! :cool: sticky this Hymee

HKS Legamax rated 2, 100mm tip
Apexi hybrid megaphone rated 3, 105mm
Re Amemiya rated 3, 90mm
Autoexe rated 1, 90mm
Odula VSpec rated 2, 80mm
Tanabe Medalionrated 4, 90mm
Racing Beatrated 1, 100mm
Knight sport SE763rated 1, 76.3
PanSpeed rated 3, 76.3mm
Fujita Eng rated 3, 90mm
Fujitsubo Legalis R rated 2, 90mm
R Magic rated 2, 90mm
Ganador Stainless rated 2, 100mm
Amuse R1 Titan rated 2, 90mm


EDIT: Hymee rated (a sweet 2.5), 100mm (according to Hymee)

Taka,

How's the scale meant to work?
Does 4 = loud and 1 = quiet?
If so, Hymee should be a 1 to 1.5 max since it's quieter than HKS which is rated at 2.

yes 1= quiet 4 = loud. Hmmm... I think HKS is underrated. It is certainly louder than mine (Fujitsubo)

They are the figure from HyperRev. I will get some dB value from another book. Hang on..

This is from the RX-8 Magazine

I should have listed this as it is more scienfic, with dB values

REPLACING THE TIP SIZES FROM PREVIOUS THREAD: 1st number dB during idling, 2nd number at 6750 rpm. NA= not available:cool:
HKS Legamax rated 2, 64 81
Apexi hybrid megaphone rated 3, NA
Re Amemiya rated 3, 66 90
Autoexe rated 1, 63 80
Odula VSpec rated 2, NA
Tanabe Medalionrated 4, NA
Racing Beatrated 1, NA
Knight sport SE763rated 1, 67 82
PanSpeed rated 3, 65 85
Fujita Eng rated 3, 65 88
Fujitsubo Legalis R rated 2, 64 80
R Magic rated 2, 67 87
Ganador Stainless rated 2, 68 90 (TITAN MODEL)
Amuse R1 Titan rated 2, NA
Hymee Stainless rated 2.5 *Taka rating, 88dB @ 3/4 max rev


EDIT: Anyone interested for a HyperRev magazine locally in Melbourne. Japan book plaza order them. A bit dear http://japanbookplaza.com.au/shop/product_info.php/cPath/55/products_id/21983
But you can also order direct from them. www.news-pub.com. I order the RX-8 mag too from them

"Welcome to Dr Taka's World of Exhaust Science", very technical Taka, but informative nonetheless.
Great to use these tests as a guide to selecting the "right" exhaust, but at the end of the day, nothing beats the aural test.

In the RX-8 mag they talked about the quality of sound too: dry vs wet, high note vs low (?deep) note. I wonder what they mean :o They label it in the scale system - very subjective I would say

Here we go again ;)

HKS Legamax high and dry
Re Amemiya high and neither dry/wet
Autoexe very wet and very low
Knight sport SE763high and dry
PanSpeed bang in the middle (neither dry/wet, not high/low pitch) that is not a sport exhaust :o
Fujita Eng high and dry
Fujitsubo Legalis R wet and low
R Magic low and dry
Ganador Stainless wet and low (TITAN MODEL)


Heard HKS, Hymee and Fujitsubo - I think Hymee is high and dry like HKS. If people heard mine will be able to understand what they are saying. Very hard to describe it though.

EDIT: This is my 2600th post. Something useful eventually :D

Wow awesome Taka. Thanks a lot for the info, I'm sure it will be helpfuil to a lot of people! Uh but nojooc is right at the end of the day theres no substitute for hearing the car yourself.
I am wondering how you say your exhaust got the same rating as the HKS, maybe both of those db figures were done with the car in neutral? From what nojooc says the HKS dosn't really get loud until you are hammering it, so that might be why its rated so similar?
People have been saying that the Apexi is really really loud, so maybe if I want to go for something thats not gonna be too much trouble from police I shouldn't get one that is rated 3 or up?
I know someone has recommended the RE one, I think I remember him saying that he really likes their stuff for rotaries, because they only do rotaries.
And also so the Hymee isn't as loud as HKS?

The "Hymee" meets ADR28 for exhaust noise.

I think it stipulates a 90DBa limit at 3/4 RPM of Max. Power, so we did the test at 6000 RPM. It recorded about 88DBa from memory.

I have heard different exhausts hammering along the straight at Wakefield. I know which one I like best :)

I dunno where Taka gets the "Hymee" rating from? And the tips are 100mm, not 120mm.

For $2000 you could get a stainless hymee exhaust, another hymee stainless exhaust, a grill kit, a ..... :p

Cheers,
Hymee.

PS - DCD - I see your email - I'll respond soon!

Ah ok, the pity is in New Zealand, there are no hard and fast numbers for exhaust noise laws. Its simply up to the descretion of the guy doing the warrent, or the cop that has decided to pull you over.
If either guy is having a bad day or wants to be a prick, then your nice shiny expensive exhaust becomes about as useful as tits on a bull.
its just such a crappy way of doing it, I wish there was a number then you would know where you stand!
Cool cheers Hymee I look forward to your email.

All I can say is I have had not problems from the boys regarding noise. I do a fair amount of suburban/city/highway driving. I'm sure that if I stupid enough to be an idot I'd get pung, but it would be for something other than the exhaust noise, as it is legal. "Driving like a dickhead" or something similar. The same would happen with a stock exhaust - it all gets down to how "responsible" you are.

BTW - How the hell can a fine stick for something that cannot be "measured" against a yardstick?? Pehaps the coppers over there are OK with being paid whatever the boss feels like paying them each week, and they just have to accept it?? That is about the best analogy I could make!

Cheers,
Hymee.

Basically the exhaust noise law was a knee jerk reaction to a perceived "boy racer" problem in auckland.
Well I say percieved but there are a lot of young guys over here that do stupid stupid things in their cars. People started complaining so the high ups, decided to crack down on the "boy racers". Heck it was even called the boy racer law!
I think for a few very short weeks, they had actually passed a law banning all cars that didn't have standard exhausts, but that got turned around pretty quick. then it was that a car couldn't have a differnet amount of mufflers from stock, then it was that a car could be modified but only if it was from the factory, so don't worry all the guys that get the expensive euro work done in factory are ok.
Its finally settled to be a car can have its exhaust modified, but the exhaust cannot be "appreciably louder than stock". I bet I could count on one hand the number of warrent shops and cops in NZ who know how loud a stock RX8 is with any real accuracy.
Like I said it all just comes down to how the guy giving you the warrent or the cop driving th eother way feels on the day. I don't care about cops, cause I don't go out and cruise around on weekend nights, when they are out hunting for "boy racers" but I am worried about the warrent shops. Thats why I want something that is reasonably quiet under 5G or so so when they do the ear test in a warrent shop it should pass sweet as.

I dunno where Taka gets the "Hymee" rating from? And the tips are 100mm, not 120mm.


Gomez and Lexic said their tips are larger than that. Maybe their eyes are bigger :p

88dB at 6000rpm... OK up dated. I still stand the rating of 2.5 (Taka rating :p )

Exhaust laws have changed DCD.

But the good news is your new exhaust system was factory fitted by Mazda as a factory option so the cop can't do shit since its a factory fitted option.

All it takes is one phone call to my girlfriend and you have that problem out the way.

For Example......

My FD has a 4" Full Exhaust System by Apexi (N1 Race Spec Version) Its pretty damn loud. Sets of car alarms blows 1 meter flames etc But its a factroy option according to Mazda. Oh yeah I work there so I can say what I like :P

Don't tell the cop that though. That can't argue with a company letterhead saying so either - heheeh

Gomez and Lexic said their tips are larger than that. Maybe their eyes are bigger :p

88dB at 6000rpm... OK up dated. I still stand the rating of 2.5 (Taka rating :p )

Ummm, no I didn't......?

How have they changed exactly? I thought that the "not apprecably louder" rule was still in effect?
Is that a fact? Offical mazda letterhead you say? Well well well :D:D:D:D:D:D:D If that isn't the best news I heard in a while!!! It'll be well worth joining FD Kai just for that letter!!!!
How hard would it be to get a hook up for that offical notice if I decide to go ahead with an exhaust?

I mentioned that my tips seemed to protrude longer than gomez's and that was the difference between ours (we have different tapered tips). I'm to lazy to measure them to find out how big they are! Besides size doesnt matter its what you do with it that counts!!! And Hymee KNOWS what to do with it!!

And Hymee KNOWS what to do with it!!

Now he does it with mechanical viagra (s/charger)! LOL :)

....... My memory fades. I have an impression when you guys told me and it is certainly was not 100mm. Anyway,

Mechanical viagra - I guess Hymee's s/c is more like a Caverject (alprostadil) - in injectable form - for the RX-8.