Sorry, yes they are a race only header. 2 1/8" primary w/ 3 1/2" collector and have an adjustable slip tube collector extension. The front and rear tubes are separate from the center 2, and it looks like the rear tubes go thru the fenderwell and around the frame. Nice looking stuff, I just don't want to waste the money if I have to beat the hell out of the like I did my Hedman Hustler 2" headers.