If you get a svt header swap, you are most definitely going to need the svt cat and flex pipe. once that is all swapped over a svt exhaust kit will bolt right up. a zx3/zx5 exhaust will be exactly the same but will need modified holes in the flanges that will bolt with the flex pipe. I would just get a svt exhaust to save yourself the trouble. good luck!
Smoke tires not drugs