I am trying to make a decision on the exhaust set up and leaning towards 3'' downpipe/ mid pipe and test pipes with oem (stock) catback . Would this set-up completely defeat the purpose due to restriction , what would be the difference in hp gain than having full turbo back . Anyone have anything similar ? . Any opinion , input , first hand This is what i'm leaning towards http://jhmotorsports.com/shop/catalo...edc3f9952ead46

 

it would create a bottle neck that would restrict the full amount of power that the full exhaust would have accomplished. you'd still be gaining a nice amount of power and you would also be spooling alot better. i say either throw in an ss autochrome cat-back for really cheap or get you some cut-outs right at the base of the dp's. the upside of the stock exhaust would be a quieter rumble. all in all the stock exhaust with the dp's and mids would be fine. i say go for it!

http://www.dmhperformance.com/ecutout.htm
i'm lookin to pick up a set of these very soon.