The SPS cat-back is just a stock system enlarged from a 1.75" piping to 2". Interestingly enough, that'll do considerable amounts to power and sound, but I'd just as soon make my own cat-back, seein' as how it's generally cheaper, and you get the experience.
I thought the SPS headers were hotshot? anyone care to comment? If that is the case, then I have heard nothing but great things about them except that they are not C.A.R.B. friendly...
