Hi Matt,
Couple of questions, is it a full pipe, with headers? or from the header flange, with cat gone?
If a full system, or from the header flange, without the cat, then if ur system is stock? ie, still has exup in place, then that will go.
Myself... i would get a PC3 and fit it, then take to someone thats recomended
and just get it custom mapped, it really is the best way to go, cost prob $350 ish, PC3 is all u need on the 07, they dont run anything other than engine management..
The gain is in HP... stock there around 149/150 .. with pipe, race cleaner, cat gone, and a custom mapped PC3.. u would with a healthy engine get 170 plus... mine is at 172.4, my mates is 174.2... same engine, same mods...
Thats the way i would go....