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im not here to bash. but the ISS exhaust is the ugliest exhaust i have ever seen. it just looks way too out of place on the back of the ISF.

IMO JoeZ is the way to go. its lighter then stock. it makes alot more power. and it sounds perfect. it also fits like a glove.

as far as those ISS dyno numbers. until you can put a joez on the same car, and run a dyno with it, and then run a dyno with the ISS on, and compare, with equal temperatures and cool down times. im going to say that dual 2.5" catback is as much power as its going to make, and they are both equal. 2, 3, 4, even 5hp....your not going to notice.
 
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