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C2 Side Exhaust

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Old Mar 3, 2026 | 10:00 PM
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beckertim
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Default C2 Side Exhaust

I have a 1965 corvette that had a very tired 327 300hp engine. I have the GM side exhaust. I put a new 400ci Blueprint engine in and the GM sound side pipes are extremely loud. Does anyone have experience or suggestions to get a quieter exhaust for my application?
Thanks
Tim
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Old Mar 3, 2026 | 11:30 PM
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Talk to Eric at classic chambered exhaust and have,a set of mufflers made with longer resonators
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Old Mar 4, 2026 | 07:50 AM
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High-Flow has several options with smaller diameter inner core ( closer to original) and ceramic packing. New side pipes might quiet it down some if your old ones are rotted out inside. But there is a rule of thumb - large diameter core/low restriction/more power/very loud vs small diameter core/high restriction/less power//quieter. And an engine with high compression and lots of cam tends to produce louder exhaust.
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Old Mar 4, 2026 | 08:04 AM
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My friend recently swapped out the original sound pipes that were on his car for the Hi-Flo Quiet pipes, Made a nice difference / reduction in sound. You still very much know you have side pipes, but just toned down a bit. His engine is a 327 built to L79 specs.
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Old Mar 4, 2026 | 11:25 AM
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Originally Posted by Scott Marzahl
Talk to Eric at classic chambered exhaust and have,a set of mufflers made with longer resonators
I've got Chambered's 2-1/2" Vettepacks on the 65 L76. I couldn't be happier with them - and they let the engine breathe better than the aftermarket sidepipe mufflers that were on the car. Here's a link to my install post.
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