Anybody running this kind of set up? Are the factory mufflers restrictive? I love the tone of it but would like a lil more umph if you get what im saying.

 

There's a member here that has test pipes with the stock exhaust and he's blowing some exhaust packing out(fiberglass or something like it).

Why not go HFC?

 

go high flows, they're not raspy like test pipes for the most part.

you could also go with a greddy sp2 rear muffler and delete your mid muffler and keep stock cats which would sound really nice also.

 

putting mine on tomorrow w/ stock muffler ill let you know

 

I have gutted RT High Flows with a Japtrix Y-Pipe and B-Pipe. I enjoy the sound but to be honest, the Y/B Pipe only subtracted 0.05, half a tenth of a second. the sound is good but go with real HF's, no test pipes. My car smells terrible, almost embarrassing at some lights if there's no breeze.

 

Its a common set-up. Go for it.

 

I would recommend test pipes with stock y-pipe and muffler. If you are going to change out any 1 part of the catback system, do it all at once. That's my opinion ...

Most aftermarket y-pipe will be too big for the stock axle-back (Midpipe + muffler) section. Therefore, the axle-back section will create an orifice-type restriction, which will nullify any effects from adding a y-pipe. Of course if you get some kind of reducers, that may help.

 

I have cheapie ebay resonated test pipes and stock exhaust. very nice combo - not to loud but a little louder than stock.

had a custom dual 2.5 apex exhaust on there along with test pipes and it woke the dead. slapped the stock exhaust back on and i'm happy.