question for those who already bought an aftermarket one , is it really worth changing to an aftermarket one? how much better is it then stock? let me know because $225 dollars is not something i wanna spend if its not nesscesary. i also am trying to put on the exhaust this week hopefully so thanks for some quick replies.

 

If your doing a turbo back I would go ahead and install the O2 housing. I installed mine with the 10.5 hotside and tubular manifold. As a package together they make a big difference.

 

If you've already got your exhaust done from that back, you should get the bigger housing. I also added mine along with a 10.5 hotside and tubular header...big difference.

 

really ok, well i purchased a HKS Hi power exhaust muffler, and i plan on doing costom 3 inch pipeing back, with a ultimate racing 3 inch test pipe, i guess im gonna have to put it off till i get the test pipe and that then. any peticular one you guys would recommend?