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3" exhaust on a c3

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Old Jan 25, 2008 | 12:06 AM
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From: Porters Lake Nova Scotia
Default 3" exhaust on a c3

ive got some aftermarket hooker headers on my 1970 that are about 15 years old but brand new(dont ask), and im looking to finish the entire exhaust system but i havent been able to find an exhaust system for a c3 with a 3"exhaust. And if i do have to go down to a 2.5" exhaust, will there be any performance issues like back pressure or anything like that?
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Old Jan 25, 2008 | 12:09 AM
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We need to know what you are running for an engine before anyone can tell you the effects of 2 1/" pipes.
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Old Jan 25, 2008 | 02:08 AM
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2.5 inch exhaust shouldn't normally be a problem restriction wise until you get up around 500hp or greater, regardless of the engine.
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Old Jan 25, 2008 | 07:50 AM
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last time it was dyno'd it was about 525 hp, maybe 3 all the way through is a good idea, and its a S/B 350
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Old Jan 25, 2008 | 08:15 AM
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Keep the 3" system.

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Old Jan 25, 2008 | 11:56 AM
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If you are really at 525 hp (a ton for a streetable 350), then the 2.5" will cost you a little horsepower.
As long as you make sure to run very free flowing mufflers (like Magnaflow or Borla) it wont be horrible,
but it will be measurable at the track.
Seat of the pants, I doubt you will notice the difference.
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