^^yep i would just go to an exhaust shop as well, will cost u a hole heap less
as aaronng said cat backs wont gain u much power so it probly a waste of money to be spending that much on a full s/s "brand named" system
were u could spend half the money from an exhaust shop and get decent gains for what u've paid.
+ the buddy club exhaust are really really really load, and u'll most likely cop a defect for it