I installed the Summit kit on Wednesday. I wasn't able to do it myself, per se, but with the help of a couple friends, I was golden. It only took us two and a half hours and some time on the tubing cutter.
I did a Summit kit on mine last year. I added their H pipe kit to mine also
and it sounds really good. Total was under 250 bucks for all.
Stainless is always better but I figure what the heck I will get several
years out of this kit and if I still have the car worry about a replacement
way down the road.