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

Exhaust ???

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Old Jul 12, 2015 | 01:51 PM
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Default Exhaust ???

I have a stock 1988, 35th Anniv. model. I am thinking of deleting the mufflers with a straight pipe to the original tips for more/different exhaust note. If I delete the cat converter will I possibly throw a CEL or code? Is there an actual muffler before or after the cat and also the 2 back mufflers right before the tips? Thank you for any and all replies.
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Old Jul 19, 2015 | 05:54 PM
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There is no O2 sensor after the cat, so it wouldn't throw a code. The mufflers are at the very back of the exhaust right before the tips. There will probably be 2 little pre-cats on the front Y before the main cat unless someone has already deleted them.
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Old Jul 20, 2015 | 07:41 AM
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Originally Posted by shotchkiss
There is no O2 sensor after the cat, so it wouldn't throw a code. The mufflers are at the very back of the exhaust right before the tips. There will probably be 2 little pre-cats on the front Y before the main cat unless someone has already deleted them.
Thanks for the reply, I had the shop remove the mufflers and put on straight pipe to new tips then it was discovered my Y-pipe had split so I'm waiting on a new Y-pipe. I'm anxious to hear the results.
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Old Jul 20, 2015 | 12:45 PM
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I finished my exhaust this weekend. Cats, X-pipe, no mufflers.

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Old Jul 20, 2015 | 12:55 PM
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Originally Posted by ovrebo1
I finished my exhaust this weekend. Cats, X-pipe, no mufflers.

New C4 exhaust - YouTube
Sounds great, I kept my cat, am going with a new Y-pipe, no mufflers and straight-cut chrome 2.75" tips. I recently put Flowmaster 40 series on my Dodge Dakota 4.7 and really like the sound of it so if I'm not happy with the muffler delete, I may go that way. It's funny how each engine can sound so different with the same muffler series, I had the 40 series on a Ford 302 and it sounded like a diesel train engine-not what I was after at all.
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