C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Exhaust suggestions

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Old Dec 15, 2002 | 10:06 PM
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Default Exhaust suggestions

I have a black 1991 C4 6 speed convertible. I am looking to replace the exhaust for better perfromance and sound. The only mod I have so far is a K&N air filter. Any suggestions on what type of exhaust system to go with? What about true dual instead of cat-back? Thanks. :rolleyes:
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Old Dec 15, 2002 | 10:40 PM
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Default Re: Exhaust suggestions (sporanox)

My suggestion would be getting the following: 2.5" diameter front y-pipe w/out precats, a high flow cat (or get rid of the cat if emissions is not a concern), a 2.5" diameter rear y-pipe, and top it off with a pair of the performance mufflers of your choice. Most of the performance mufflers are pretty equall in performance so you just need to pick the ones that have the sound you want. This combo will give you a pretty nice gain in performance. :cheers:
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Old Dec 15, 2002 | 10:55 PM
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Default Re: Exhaust suggestions (sporanox)

:iagree: The only two other issues are:

1.) Material constructed from (stainless steel = longer lasting = more $$)
2.) The style of the tips (round, square , rectangular, LT1 etc.)

Good luck in your search. The pic in my signature shows MagnaFlows with round slant cut rolled 3" tips on an '86.
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Old Dec 15, 2002 | 11:02 PM
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Default Re: Exhaust suggestions (sporanox)

Power Effects
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Old Dec 16, 2002 | 01:49 PM
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Default Re: Exhaust suggestions (sporanox)

Welcome! :seeya

What kind of sound are you looking for? I could tell you that my Walker Y pipe combined with Dynomax UFSS mufflers have a deep low tone to them. It is louder but still deep low with the addition of headders and a hi-flo cat. Others could chime in on their sound characteristics if sound is as improtant to you as it was to me when I was looking.
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Old Dec 16, 2002 | 01:53 PM
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Default Re: Exhaust suggestions (sporanox)

B & B Tri-Flow :smash:
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Old Dec 16, 2002 | 02:30 PM
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Default Re: Exhaust suggestions (Zora)

I don't want to steal this thread, but Zora your car looks damn good with those wheels. What brand are they? What size?


[Modified by all4c4lt4, 7:31 PM 12/16/2002]
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Old Dec 16, 2002 | 02:48 PM
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Default Re: Exhaust suggestions (sporanox)

Since you stated "replace", I recommend
-2 1/2" SS front Y, no pre-cats
-Random Tech cat
-hi flow cat-back (I like my TPIS cat-back, it has some resonance; check my site for performance gains with this setup).

To maximize the gains I suggest you also cut the air filter lid to let more air into the motor.

You may also need to install an AFPR to realize the max gain.
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Old Dec 16, 2002 | 03:21 PM
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Default Re: Exhaust suggestions (all4c4lt4)

I don't want to steal this thread, but Zora your car looks damn good with those wheels. What brand are they? What size?
I believe those are Fikse FM/5s, someone correct me if I'm wrong
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