ganseg

iTrader: (5)

Please correct me if I am on the wrong path. The cat in the 2004 I just bought only has 12,000 miles on it. I am thinking that since i am starting to premix, that I may hasten its demise. I plan to run 1 oz of Amsoil Saber Professional per gallon. So I was thinking i would replace the cat with a midpipe - currently thinking of the one from Racing Beat.

So, does this make sense?

Subsequent question is should I be looking for a 2.5" midpipe? I don't want to cause a problem in the exhaust flow given that the cat-back portion will be the stock exhaust.

Two other factors: I also want this to be as quiet as possible and I only do HPDEs twice per year. The rest of the time this is my daily driver, including winter.

Thanks!

shazy

Wow Thats wayy too much. 13oz per full fuel tank?!
You don't need that.
Just use 1/3oz per gallon. Works for me

04RX8man

^yes that would b the amount u would run if ur OMP wasn't hooked up....

I do 8 oz to about 12-13 gallons....

I've been premixing for like 25k miles and have had not cat problems(knocks on wood)

I8U

iTrader: (1)

I use 8-12 depending on the use of the car. 8oz for everyday driving, 12oz for track events.

ganseg

iTrader: (5)

I have had the car 2,000 miles/3 weeks and haven't seen it use much oil. Supposedly has had it software revisions although i haven't had a dealer confirm it. Just says they did it on the dealer's service history and the Mazda warranty history. I am at 35k. Is there anything to be cleaned out of the OMP? I don't know how good the past owners were about changing the oil. i changed it about 1000 miles ago. I have also redlined it at least daily.

Btw, since i bought it I have changed plugs, engine/cabin filter, coolant, trans and diff fluid. It idles more consistently due to premix and plugs.

9krpmrx8

iTrader: (46)

Only TC-W3 premix is hard on the cat. Amsoil Saber Pro will be fine for your cat but you are using too much.

That being sad, a mid pipe will get you some decent HP but you have to choose wisely and know that with a mid pipe, cruising in traffic with the windows down gets smelly and standing near your car while its running is not an option unless you like smelling like gas and oil.

Lastly, mid pipes are generally loud so choose wisely.

GeorgeH

iTrader: (2)

Might as well get a mid-pipe with a high-flow cat in it. Compared to a straight mid-pipe, it will be quieter, won't smell as bad (although you will still smell it), no CEL, and replacing it is much cheaper than an OEM cat. Oh yeah, and it will still make good power.

9krpmrx8

iTrader: (46)

Yep, what he said.

xun4gvn4everx

iTrader: (2)

Nothing better than a gutted supercat connected to an AP catback. It is..... the smell and sound of glory!!! *sniffs the air*

9krpmrx8

iTrader: (46)

Haha, we installed and HKS Hi-power with a RB mid pipe the weekend before last and it was loud and smelly!! Tomorrow it will be TurboXS and mid pipe so we will see which is louder and smellier (sic).

xun4gvn4everx

iTrader: (2)

^ As far as I have heard and smelled, I had the loudest and smelliest setup.... and the biggest flames! BUT, I have not seen that setup yet, so I am curious

ganseg

iTrader: (5)

I was thinking Racing Beat dual resonator or BHR single resonator and stock cat back. The smell probably won't bother me but loud will. I'm 49 and the only place I want to hear it is at the track. Home and work ar not the places I want to be making a lot of noise.

Still open to suggestions - the best hi flow cat? The quietest midpipe?

xun4gvn4everx

iTrader: (2)

^ It all comes down to, "what is your opinion of loud" to me, my set up was quiet when I wanted it to be and loud when I put the pedal to the metal. BUT, my opinion may not be the same as yours. so, your best bet is to head out to some local meets and check out what other ppl's setups are. RB dual Res is new, so noone really has it, so it may be a lil hard to find someone with it. Another dude here on the coast, has a gutted super cat as I do, but has an RB catback and his is about half as "loud" as mine when he floors it. though, it is still the same volume/ "loudness" as mine when he/we are cruising.

9krpmrx8

iTrader: (46)

I have the SR motor sports cat less mid pipe with the stock cat back and it sounds great at throttle and just a tad more aggressive at idle.

xun4gvn4everx

iTrader: (2)

^ I would love to hear what that setup sounds like. I have never heard of your setup let alone any catess stock catback.

9krpmrx8

iTrader: (46)

I will shoot some lame Blackberry Video tomorrow and post it up.

xun4gvn4everx

iTrader: (2)

N I will maste..... .....yea that just happened...

xun4gvn4everx

iTrader: (2)

Come spring time, I'll show you my setup. Though KIT is gone, I have my AP and I'll pick up a gutted super cat again or a straight midpipe and let you hear what I had/have

_____alpha

I got this Code on my Car but wasn’t sure what was making my Car idle very strong . I was Told about Premixing your car makes the idle strong . But can someone explain the Cause of this ? I got my Plugs 2 years ago brand new . And ever since I started itemizing my Rx8 . Through time it started to make it Rough on my engine . I was told it could be a Vacuum Leak but I’m not Too Sure of the Purge Valve solenoid . Any reason to why that would happen ?

Loki

iTrader: (1)

Premixing doesn't do anything for your idle.
You can verify a vacuum leak by looking at the fuel trims at idle via the OBD plug.
It could be a lot of things, best thing to do first is see if there are any check engine codes. Is the check engine light on?

You haven't mentioned if the coils have been replaced recently. Really need those.