Get a good aftermarket high flow main cat. The SVT unit sucks.
I can get you a CarSound (makers of Magnaflow) cat from my distributor if you want. It is a high flow unit.
But get a hold of me ASAP, I am heading to Kalamazo this afternoon so I could bring it with me.
In any case yo don't want headers and no cat cos the rasp is HORRIBLE without a main cat.
email me
anastazi.sarigiannis@aam.com 
