How restrictive are OEM LS1 mufflers?

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09-20-2008, 01:50 AM

#21

chrs1313

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gained 20rwhp woth my cutout in stock exhaust...qtp ory

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09-20-2008, 10:11 AM

#22

Striped02WS6

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its loud because it is the loudmouth 1 system...you will kick yourself in the butt for going back to stock..pick up magnaflow or hooker and call it good...

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09-20-2008, 10:37 AM

#23

blown03mustang

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a local guy made 440 on a h/c (torquer 3) setup through the stock muffler, but im sure theres some left in it, doesnt sound half bad either, a little quiet for my taste but overall good

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