Tian

I now have a Racing Beat exhaust on my rx8(04,GT,MT). I am going to get a Cold Air Intake very soon. I wonder which intake should i go for among the following choices:

1) mazdaspeed CAI

2) AEM CAI

3) RB REVi

4) K&N short ram

For now, I'd probably go for "Mazdaspeed" and my" RB exhaust". Is this a good combination?

Please give me some advices!!!

lurch519

well, the aem and the mazdaspeed are the same thing. just different labels on them.

the k&n is not a cold air, hence the short ram

the rb is only cold air when you add the ram air piece to it

personally i have the aem, love the sound.

dont expect to make much horsepower from any of these.

mysql101

rb is cold air, even without the ram air part. It doesn't suck air from the engine bay. So even the stock intake counts as such.

d j

I currently have the K&N ver 2, I got it mainly because of the carb sticker... there's a slight increase in sound but doesn't necessarily equal to horsepower increase, but if it did I'm sure it's not that much.
If I were you, since you already have the RB exhaust, might as well stick to RB and get their intake+duct, just my $.02

Fanman

Not sure what you are looking for. AEM/MS is quite a bit louder than the RB unit. I have the RB unit & really like it.

mysql101

check out the dyno charts from the open intakes (HKS posted dyno sheets). You'll lose power this way.

hagar852

I have the Revi and air duct... I am very happy with mine for sound and better engine response.

Tian

I'd like to say a "thank you" to everyone who's sharing his experience with me here!

according to you guys, the AEM and MS CAI are the loudest ones. Since I want my 8 to be a little loud, I will probably go for one of these.

However, my concern is actually the fact that i already have the RB exhaust. should i get the REVi because they are the same brand, so this combination would work the best? I am thinking that when the RB guys design the REVi, they may try to match the intake with the their own exhuast. Am I right?

The question boils down to : do the "intake" and " exhuast" work indpendently or they slightly influence each other? so, when I decide which intake to buy, how much do i need to consider my RB exhaust?

hagar852

They are independant.....

Racing beat designed both systems not to be obnoxiously loud.... Which is why I like mine.

Vasichko

iTrader: (1)

I am kinda skeptical of this... Maybe a sales ploy to make us want to fork out the $650???

The only reason I am doubting this is because the difference in a intake from car to car should not net more gains just due to the fact that it is enclosed. In fact the HKS isnt completely enclosed, its open at the top. I find it hard to believe that this would yield any more power than the MS/AEM that is placed right behind the front grill where air is being rammed into.

mysql101

They tested the stock intake, a fully open intake, an intake that is partially open, etc.

And they showed one that was partially open allowed the most air, while keeping the intake temps down. But the gains were similar to that one of that was fully enclosed. The only one that suffered was the completely open intake.

As we already know, the gains from the intakes are minimal. So I would never recommend $650

The reason I brought this up is because the results show that a fully open intake is a step down from even the OEM box = dumb move.

PerformRX-8

you're never gonna get a straight answer because everyone is gonna tell you to get what they have on their car..... I say AEM/MS or REVi w/ Duct

Trekk

Not true if you add the RB ram (or other) to the K&N. W/o a ram you are just going to suck up hot air. It has no way to really get freash air. With a ram it is the more or less the same as a cold air intake.

mysql101

The revi and the stock intake both fit up to the front bumper and suck air from the area in front of the engine bay. they do not suck hot air from the bay like the K&N system does.

CAI doesn't mean the intake must be physically in the air stream. So the ram air add-on isn't required for a CAI.

shaunv74

Cold Air Intake=taking in air from outside rather than from the hotter engine bay. This is a good idea. That is why our stock airbox is a cold air intake already. That is why I like the stock intake best.

Ram Air=using the dynamic pressure from the relative velocity of the car moving through the air to try and force more air into the engine. There is some debate around the effectiveness of this and what gains there are from it. That is probably why our car does not come with it stock.

In my opinion the best combination is the stock airbox with the RB ram air duct. Just so I can say I fiddled with my intake.

305WANKEL

I Have A Friend Who Has The Rb Exhaust And The Revi Intake- I Personally Dont Like The Sound- If You're Looking For Great Sound- I Would Go With The K&n , But Make Sure Its The Version 2- I Would Not Recommed The Ms Or Aem Because On A Rainy Day, It Could Cost You Your Engine Due To The Position Of The Filter Below In The Car

Tian

That is one of the biggest things that stops me from getting the AEM/MS.......how bad is it? a normal rainy day would result a failure of the engine?

Trekk

I dont know where you are going with this. My point was if you have a K&N v2 it's going to suck up hot air. You put a ram of some sort on the car that forces outside air into the engine bay, inches away from the filter you are not going to suck up hot air. The temps I read right off the filter and the maf are the same deg (give or take 1) as the outside air. Yes I still suck up hot air at a stop light, but even at 5mph the temps drop a huge amount.

Vasichko

iTrader: (1)

I wouldnt worry about that. The only issue you would have is if you completely submerged the filter in water. I have had CAI on all of my cars, some slammed with coilovers and never had any issues.

If the weather is the worst, drive in the middle lane, but that is what I do regardless.

StealthTL

iTrader: (1)

"Sucking enough water to crack the motor" is kind of an auto/urban legend, comes up every now and then that "....my cousins/friends/hairdressers brother went thru this deep puddle...."

Don't lose any sleep over it.

S

mysql101

You will get hot air when the car isn't moving. That air may cool down once you start moving, but it helped heat soak your engine, which doesn't go away instantly.



Some of us intentionally pour water into the engine in order to clean out the carbon. Water into your intake isn't going to kill the engine. It'll help steam it clean though.

Trekk

If you think the heat soak is bad from a K&Nv2 sitting at a stop light. Then the Greddy turbo guys (or any under the hood filter turbo)must have it really bad. Sucking under the hood air up and not moving so the intercooler isnt working. Might even be blocking the radiator enough to slow its cooling. Most likly putting off more heat then a N/A motor, thats gotta be great.

mysql101

That's one of the ways how you can tell someone is really looking at making the car run well, vs those who just want a turbo slapped on. Most of us who are serious about it, immediately change the greddy intake out and route a pipe through the bumper. Mazsport even makes a kit for this exact purpose.

PerformRX-8

Thats actually completely wrong, in order for there to be an engine problem, that means the filter has to be completely submerged. that means you would have to drive in 2 ft of water or more, but you would be an idiot to do that....I drove through what seemed like a hurricane, and when i pulled into my garage, filter was fairly dry...

305WANKEL

NO NOT JUST A RAINY DAY , BUT IF IT RAINS A LOT , WATER ACCUMULATES ON THE SIDE OF THE ROAD, AND WHEN YOU DRIVE BY THE WATER YOUR INTAKE IS SUCKING "AIR" GUESS WHAT ITS GONNA SUCK TOO- WATER - AND THATS GONNA DESTROY YOUR ENGINE