Depends what you consider kinks, some have to do some fabrication. Its just hard to see 180$ headers fitting correctly & sealing correctly with no ticking/leaks since theres so many other headers that cost 4x as much.
Im pretty satisfied with my headers I guess... Well not right now.
But no out outside the GP community hears of grand prixs with headers
For the amount of time, 9 hours is a long, tiring day of dealing with annoying bolts and tough install I guess, but this is really my first large exhaust job.