i know when i swap from my mac off road H pipe to my one with cats for emissions i can notice a difference. the exhaust is not as throaty and kinda dull. there is also a slight heisitation in acceleration. if you were thinking of a mac H pipe i would get a pro chamber, i have heard good things about them.
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NewEngland Auto www.baystategearheads.com
-91 Mustang Coupe, ex 4cyl (sold)
-99 F150, 3" lift, 35" Procomps, Magnaflow exhaust
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