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· Mobile Audio Specialist
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396 Posts
Discussion Starter · #1 ·
I was thinking about this the other day

First off Remove the entire exhaust from the down pipe back, I.e. Catalytic converter, Resonator, Muffler and all piping. Buy, one of these cherry bombs

This will act as a resonator and cut down on the high pitch raspyines however without the resistance of the stock resonator and cat.

Next, We run 2.5' pipe all the way back and it will end in a Y pipe for dual exhaust, I think mangflow or flow master would work best
Just like this


The only issue without the Cat is that he CEL light would be on and you would not pass emissions, There is however a work around for this, GET A TUNE at your local speed shop and they can force the computer to ignore it, Follow this up with a good intake and I could see a net of 25 maybe even 30RWH added.
 

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I tried something similar with a previous car. The CEL never went away, even after trying 5-10 different "tricks" that supposedly work for other cars. I even put a high flow catalytic converter, wired the secondary O2 sensor after it, and I STILL got a CEL.

I don't think your "local shop" would be able to modify the computer to ignore a code like that, but if you can get it to happen, that's pretty cool...except your car would most likely sound like garbage with nothing but a cherry bomb and a few straight through mufflers.

Not trying to burst your bubble, just telling you how my experience makes me feel about your idea.
 

· Mobile Audio Specialist
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396 Posts
Discussion Starter · #3 · (Edited)
I tried something similar with a previous car. The CEL never went away, even after trying 5-10 different "tricks" that supposedly work for other cars. I even put a high flow catalytic converter, wired the secondary O2 sensor after it, and I STILL got a CEL.

I don't think your "local shop" would be able to modify the computer to ignore a code like that, but if you can get it to happen, that's pretty cool...except your car would most likely sound like garbage with nothing but a cherry bomb and a few straight through mufflers.

Not trying to burst your bubble, just telling you how my experience makes me feel about your idea.
Those mufflers are not straight through, and we are starting the cherry bombs and replacment resonator tomorrow the cat's are staying, 450 for the tune but they said they could disable it though but this will be more budget oriented
 

· Mobile Audio Specialist
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396 Posts
Discussion Starter · #5 ·
so your exhaust will be

headers > "down pipe" > cat > cherry bomb > y-pipe > turbo muffler(x2)
Yup MangaFlow or Flow Master, Were doing the resonator delete and Cherry bomb swap Friday, I will let you guys now how it goes. I might do it on my Impala to.
 

· Registered
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159 Posts
I hope that you don't take this post the wrong way, but here goes. Your car might sound great from sitting inside the vehicle. Even with the windows open it might sound great...but that doesn't mean that it sounds great to the person behind you that can hear all the rollover. Rollover sounds like you've got something wrong(almost like a backfiring sound) and it happens when you rev the engine and then let off. it happens when you shift, too(both AT and MT). You hear rollover a lot in 4 cylinder engines, but it appears in ALL engines. It has to do with the pressure/flow change in the exhaust. The more restricted your exhaust is, the less you hear it and vise versa. Your stock exhaust doesn't produce audible rollover. If you put straight pipes on it, your car will sound like crap every time you let your foot off the gas. Here's an example : From Magnaflow's "hear it" section, go to the american muscle and click on the 83-92 Pontiac Firebird video.

If you want to play it safe with exhaust, keep it quiet. You most likely won't be able to reproduce the quietness of the OEM exhaust without using a ton of aftermarket parts or putting some of the OEM parts back on, so don't worry about making it too quiet. If you happen to make your exhaust too quiet, you can always cut a resonator out to make it a little louder.

My suggestion : Take the stock cat-back off. Add a straight through resonator and add a nice big straight through muffler with a tip that fits the bumper(I've been reading that 4" looks great). If you want dual exhaust, I would still use a resonator before the Y-pipe.
 

· Varsity Squad
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751 Posts
I wouldnt say my exhaust sounds awesome if I was the only one who thought so. I get a lot of complements from the camaro guys with their V8's, and even a few mustang drivers. I also noticed an increase in power and mpg's.
 
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