Have a RP Midpipe and HKS exhaust....noticed a gain in the butt dyno....wanna trade out the HKS unit for the Turboxs if anyone's looking to trade...midpipe plus HKS equals lots of droning....plus I don't get a cel with stock exhaust and pipe, but with hks and pipe I do ...no idea why.......going to get a dyno before end of summer...have stock parts so can swap between parts to give exact gains as my car see's them

 

If you get the turboXs can you bolt it to the stock midpipe? I wouldn't really wanna put the turboXs mid pipe in untill one of the new F/I kits comes out.

 

Read this TXS thread specifically mine and adrian's post.. #106 & #108

So to answer your question, yes you can.. but no I would not recommend using with stock cat. Believe it or not, it's actually louder with the cat. If you're not worried about emissions, just get the midpipe. It wouldn't be a wasted mod that you'd have to get rid of when you go FI like an intake or something..

 

find some sound clip and listen to em, look at some pics and make up your own mind. like the others have said there are no gains in the exhaust to it will be purely cosmetic.