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Discussion Starter #1
do performance mufflers give you any hp gains? I've seen ads that promise 10-15 HP. This sounds to good to be true.

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CARPEDIEM
 

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It is bs

You need the hole exhaust to get those gains.

Just adding a muffler will only make you sound faster. lol

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To get those gains you need headders, pipes and muffler, bat got a 14 hp gain @ the wheels from full exhaust .
 
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