I have a RP High-Flow cat with Greddy exhaust and I'm thinking of picking up the B&B straight through midpipe however, I am also getting a FI soon and was wondering which pipe would be the best for the turbo? I've heard some people getting backfire issues with the High-Flow cats, but then there are CEL problems with the midpipes. I can get the B&B for $250 and I already have my High-Flow cat.

Also, how much of an increase in sound will the B&B have over the high flow cat?

 

You would have an even bigger problem with backfire with the midpipe. There will be no light off whatsoever with a mdpipe.

 

The midpipe is relatively close in sound compared to the hi-flow cat. You may notice it to be slightly louder, but I think it would be marginal.

Can you clarify "Which pipe would be the best for the turbo?" What are you wanting your end result to be?

 

arent most people with fi putting their stock cat back on?

 

I did. My car is an everyday driver. As such I wanted no dicernable difference. Even when we leaned it out quite a bit, it still randomly popped. Actually it still does, but now it is about 75%-80% better. Not random, only when I de-accelerate.

 

You can't tune w/the hi-flow cat...

 

So do you think I should get the B&B midpipe since I'm going to be going with the FI pretty soon, or keep the High-Flow cat. The B&B midpipe is going to be illegal here in california, but I highly doubt cops will know that I have a straight through midpipe. Come smog testing, I have some people that have some connects or if I don't, I just put stock cat back on.

Basically I am asking this cause I can get the B&B midpipe for $250 right now, but there is only a few left. Should I go for it or keep my high-flow cat?

 

I'd make sure that the mid-pipe is compatible w/FI before you do anything. I'm sure someone will have a mid-pipe for sale at some point down the line if you miss out on the deal now.

The mid-pipe is illegal here in TX too, but unless the cop puts my 8 on a lift (I have MS skirts so he can't look under) and that's just not going to happen, they won't see my missing cat. Given that the mid-pipe sounds very similar to the hi-flow cat, that's what you can state you have on your car. And you have the Greddy exhaust so the cop can visibly see the aftermarket tips and they'll more than likely chaulk the sound up to that.

Regarding smog testing, I plan on putting my stock cat back on a few weeks before I have to test. If I can find the hook-up then great, but otherwise it's back to stock for a little bit.

 

keep the high flow cat. It works well with the turbo. I have the RP High Flow Cat+Greedy Exhaust+Turbo.... works great.

Backfire is going to happen with a rotary engine... it's not really going to cause any problems.

Midpipe will give you check engine light problems and and your car will wreak of a gas (which is a dead give away to the officer). Midpipes are also illegal in certain states and the fine if your are caught with one is outrageous. Also, a midpipe will be louder than a high-flow cat and also backfire more.

-HS

 

The hi-flow cats work w/turbo, but what about FI?

Hate to differ with you Harry, but...

I don't usually get CELs w/my mid-pipe. There's a 50/50 chance that they'll throw. It's not a problem with the pipe, it's just the way the O2 sensors and the 8 reacts to it.

Jenkins has the hi-flow cat and I have the midpipe, both of us have Greddy exhausts. Put us side by side and the different is barely noticable. I don't even think it's a matter of noise level that different rather more the type of noise you hear.

 

FI=forced Induction=turbo

 

:o Thanks. I had a feeling about that....

 

I have had the SR high flow cat with resonator for about 1 year. I have had the GReedy turbo installed in February, since then I have not had a backfire issue until I recently had the GReedy RS BOV installed. Once the BOV was installed, there was much more of a backfire issue, particularly when I decelerated. After speaking to Scott from Mazsport, he told me to adjust the BOV, in the hard direction until the adjustment was good. I have been doing adjustments over the last week and much of the backfiring has stopped.

 

Got to be careful though. When I adjusted my BOV to the harder side (too much) I started running into some stalling issues when I shifted. Random occurance, but when I would shift normally most of the time it would be OK, but sometimes it would stall out on me. Had to adjust "softer."

 

I just took my high flow off because the back firing was every single time you let off the gas and it was loud. Plus everyone will think that your car is a piece of dookie when it's backfiring down the road. Now with the stock cat it hardly happens and when it does it's 100 times quieter. My turbo likes the stock cat better anyway? Save your money!

 

I'd be careful, your car is already pretty loud and noticable. If cops are going to start paying more attention to modded vehicles such as that thread in the west coast section suggests, you'll be proper fudged. You really wouldn't noticed too much of a difference in performance anyway. No real point.