i have a rs*r invidia, which is now discontinued. its just like skunk2's except for the "invidia" badging on the side instead of "skunk2 power." rs*r makes them for skunk now. its full 304L grade stainless polished t a mirror-like shine, 60mm piping, 0 bottlenecks, all tig welded (very nice welds), 3/8" thick flanges, sounds great and comes w/ silencer.
I took a few pics for someone that inquired about buying it: