What kind of exhaust are you guies running... Also my greddy turbo should be in a few weeks,.... what kinda of exhaust would you suggest running with that system... I was thinking of going with greddy exhaust also... But not to sure... any help on this would be great...
RJ

 

the greddy is a bit loud, but the turbo quiets it down nicely. a turbo, catless, 8 with the greddy cat-back was about as loud as my stock 8 with HKS exhaust, and that's pretty damn quiet.

 

How do you go about getting it catless..... Want you get SES light on from the O2 sensor being missing also want that mess up you engine with the O2 sensor missing or what ever or make it run like crap... thanks
RJ

 

I have the Racing Beat cat back & SR Motorsports hi-flow cat (w/ resonator). Love the setup. O2 sensor hooks right up. Going catless you will probably have to get something like a casper o2 fooler. I didn't like the exhaust tips on the Greddy (rolled tips) but other than that it is a very good unit.

 

Im very interested in RB catback + SR hi-flow cat w/ resonator.

How's the sound? Is it really loud for daily driving?

Any CEL issues? Any video clips?

Thanks.

 

RB catback is going to be to restrictive for turbo..you're going to want something more open...Greddy, B&B, Borla, Espelir...i have the Espelir and coming soon the SR HF cat w/ reson...sounds awesome and will handle a turbo quite well...

 

Racing Beat flows just as much as those other units. Not sure where you heard any different. All of them give about 3 hp. If you believe their claims of 10-12 hp on cat back alone it's nonsense.

 

If you were to go turbo, which catback exhaust would flow the best with a SR HF cat....just curious.

There has go to be some variation in flow between the exhausts. Biggest piping, straight through mufflers and shortest piping. I am not for sure, but shouldn't the aftermarket exhausts have some variation in these aspects and design. I mean even a little can help a lot for a turbo.

 

Thanks so much for the answers guies.... I appreciate all the help...
RJ

 

In terms of piping the Greddy, RB & Borla I believe all have 3" piping. The Mazdaspeed seemed a bit smaller to me when I saw it. It looked 2.75" or maybe even 2.5". Everybody gets about the same in terms of hp gain (2-3 hp) so I'm not sure that one flows exceptionally more than another.

RX8 Ownz,

I absolutely loved the sound of my car when I had just the RB exhaust on it, but after I got the hi-flow cat & resonator I thought it was a bit too loud. Now that I have a turbo on it, it sounds like stock.

 

Did i say i did?

and no RB does NOT flow like the others do..the internal baffling on them is TOTALLY different...not saying that some of the others aren't the same...but to say that RB flows the same or just as much as the others is naive...

 

Where are you getting that Greddy, B&B, Borla, Espelir flow better than RB ? Just because it is a different design doesn't mean flow is less. What I am going on is that hp gain on the RB is approximate the same or better than the others. Do they all use slightly different designs. Yes, that is why they sound different but for flow rate they would all be similar. Less restrictions usually means more hp. With the muffler completely off (no restriction) you get about 5 hp.

 

For turbocharged, you want the least amount of restrictions as possible, and I believe its not the exhaust that has the restrictions, but the midpipe.

I'm also looking into exhaust options does anyone have any experience with the Tanabe exhaust? I've seen that they make one, but I havent actually heard of anyone running it. I know a lot of NA Honda guys like running them because they sound good, but thats about all I know about them.

 

I just installed the HKS exhaust on my RX8. I'm still running the cat right now and was wondering if you started out the same. the reason I ask is because when bolting the HKS to the cat using the factory bolts, nuts and springs (as the instructions specified), the nuts tightened completely on the springs, yet the exhaust b-pipe flange did not mate fully to the cat flange. Between the two you can see the exhaust doughnut gasket.

There is no leak at the b-pipe, and judging by how the cat flange is made, there was no way the exhaust flange could completely mate in the first place. I just wanted to make sure that another HKS owner had the same issue.

--ntg-R

 

Due to the thickness of the factory doughnut gasket, the small gap is perfectly normal.

 

THANKS!!! I feel better now

 

I thought the Racing Beat was 76mm while the GReddy was only 67mm . . . . . . hence, it would be LESS restrictive.