LittleJohn

Anyone know if I get a new intake eg, REVi, and Exhaust now. will they be made redundant or retired when I get FI, eg RAP AF SC or Hymee Twin Screws?
Or will they enhance the performace of the FI system I choose later.

slavearm

The intake will be, but the exhaust will most likely be compatable with just about any system you buy.

G8rboy

Agreed on the intake, but you need to research the exhaust systems- Racing Beat has said theirs is not tuned for a FI application, so you need to find something that is more free flowing (Greddy SP2, B&B, etc).

MadDog

I think there are problems with FI and the high-flow cats and midpipes. Backfiring seems to be the issue but can possibly be eliminated through tuning the A/F.

-MD

Fanman

Dude, why do you keep on saying this ? What proof do you have that the Greddy SP2 or B&B flow more than the RB ? So far I haven't seen any proof of this. Even if RB has come out & said that their exhaust is tuned for NA application, how do you know that the Greddy & B&B are not ?

As a matter of fact i wrote Greddy just a little while ago. They have several different types of exhaust. The SP2 is made for NA cars. The EVOTT is their unit for an NA car with an aftermarket turbo kit. They said no ETA, but they are hoping to get one out around Sept.

For the original question, if you get intake & exhaust, the intake part will have to be taken out, the exhaust part you can still use.

DARKMAZ8

You shouldn't bother with the rev8 intake or exhaust if you plan on going FI. That's almost a $1000 right there. You should grab the rp super cat midpipe instead.

G8rboy

What do you mean keep on saying it? when I have I said it before? Truth is RB did come out and say it- I'm not knocking them at all. No other company has come out and stated that, so I have to go on the fact that I would avoid RB's exhaust if I planned going FI, that's all.

DARKMAZ8

It depends, if you want maximum performance or not. I think the rb or any n/a aftermarket exhaust will be fine with the greddy kit. Just throw in the mid pipe and tune.

bureau13

I think the only reason RB made that comment is that noise was a design consideration for them, and with a turbo, you can worry about that a bit less, so given that they may have been able to make it flow a bit better. Fanman is right though...ALL currently available aftermarket RX-8 exhausts have been designed around a NA application, unless they were just thrown together from off-the-shelf parts, in which case they weren't "tuned" at all.

jds

Fanman

if you are not the one, sorry. There was a guy a few weeks ago in one of the threads that swore up & down that the other exhausts flowed better than the RB unit, but when pressed to present proof could not. It was just his "gut feeling." Like I said in my post, just because the other companies haven't been questioned about this doesn't mean they flow better. You have to remember that when they introduced their exhausts all the test mules were regular RX8's, the Greddy turbo was not out then. Given the fact that the RB gives about as much hp as you can get from a cat back unit, I would say it flows about as much as any of the other current units.

Hopefully, down the line Greddy will be able to test a EVOTT unit for those of us who have the turbo kit. This should be the optimum unit for us, as it is supposed to be designed with the Greddy/aftermarket turbo kit in mind.

cretinx

Most exhausts for this car are going to be less efficient and just as costly as going custom.

You can get custom 3" from the turbo-back for $1000 ($400 for high flow cat and midpipe, $600 for exhaust) from almost any real performance shop.

StealthFox

cretinx you bring up a good point as you can get your catback made to suit your application. i would love a catback that gained at least 3-4hp, was compatible with a turbo and was quad tip