i havent seen a thread on this but im defiantly confused. ive heard alot of the x02 exhaust and im interested seeing as how the military doesnt pay alot haha. so until i can afford the HKS or Stillen exhaust this might be a good alternative. Now for my question, who actually makes the Xo2 exhaust i keep hearing about.

 

X02 is just a knock-off HKS. Don't know who actually makes it, but there's plenty of "HKS Style" exhausts from our vendors here on the forum, check out the vendor classifieds sections. M2, Topspeed, DNA motoring all make one, I'm sure there's other brands as well.

 

Lots of info on this in the exhaust section. OP you definitely need to follow the forum rules and look around the forum before asking these kinds of questions.