I just actually reordered my magnaflow catback and changed from street series to comp series catback.There will not be much difference performance wise with catback vs axel back
however you should gain some hp as the magnaflow is a true 3" exhaust and you will not have the resonators like the stock exhaust.
oh yeah the reason for reorder,they sent me a catback system for a Toyota Tundra truck
Fedex picked it up today to ship back to magnaflow,I changed my order to the louder comp series.
I've planned out my mods and that helped me decide on my exhaust.I was going to go with ARH long tube headers with catted X pipe and see how I liked it with stock mufflers but being in California this would be illegal.
so I will be running magnaflow highflow converters w/xpipe and the comp series catback not to be confused with comp series muffler deletes.I'll also have Steeda Cold air induction with SCT tunner and custom tune.Check out all the systems that are out already like Corsa,Stainless works,Kooks,magnaflow and see what they sound like.There will be many others comming out in a few weeks
so We will have some choices.I want to do it right the first time so I can enjoy this beast of a car,man I cant get enough of this new 32V 5.0