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

exhaust problems

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Old Oct 19, 2015 | 06:06 PM
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Hey everyone, new to forum. I just bought a 1992 c4 with a lt4 engine and 6 speed manual trans. Car had a little exhaust noise all original. I just put flow master mufflers on no help. Car sounds good at idle and cruising but when you shift gears or race the engine it sounds awful. The exhaust sounds raspy, like tin cans for mufflers, just makes an awful sound. I live in a small town and do not have many people who known what to do but change parts. If anyone has any suggestion's let me known.
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Old Oct 19, 2015 | 06:46 PM
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You sure its not an LT1?? I have seen many LT1 exhaust manifolds with cracks.

Last edited by FASTAZU; Oct 19, 2015 at 07:05 PM.
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Old Oct 19, 2015 | 06:58 PM
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NO not a lt1 motor has been changed too a lt4
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Old Oct 19, 2015 | 07:08 PM
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Sorry you confused me with the all original statement
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Old Oct 19, 2015 | 08:45 PM
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All caps is like yelling. Welcome to the Forum. Flow Masters are about the loudest mufflers on the market.
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Old Oct 20, 2015 | 02:28 PM
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Default exhaust

Originally Posted by We Gone
You sure its not an LT1?? I have seen many LT1 exhaust manifolds with cracks.
thanks for the info you were right on it, had a chance too check them out today and found three cracks on top of manifold on both sides.
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Old Oct 20, 2015 | 02:34 PM
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Originally Posted by luckydoy
thanks for the info you were right on it, had a chance too check them out today and found three cracks on top of manifold on both sides.
Happy to help.
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