My friend has them on his 00', I have the borla and they suck ass they keep breaking. They are definatly worth the money but don't sound like a boxer. I can over look that though. Supposedly they gain like 16 or so whp and around that in tq. The borlas are half that. About the mild steel he didn't coat his but he hasn't driven it much because he got his roll cage put in and other crap, it's not his daily driver. Honestly I'd spend the money and send it out to Jet hot. I'm pretty sure once you get that coated by them they have a lifetime warrenty or some sort of good warrenty on them.