best money i have spent. thay end all exhaust problems, most of all leaks.should last as long as the car.fit perfect.only problem is the down pipe is made longer to allow for exhaust mods.if you have the stock cat you will need to cut the down pipe and weld a flange that thay include, so the cat will bolt to the down pipe. i also used fel pro 1400 gaskets and a weak thread locker to bolt the headers to the block.i had a problem with bolts backing out and blowing a hole in the gasket on my stock headers. i tryed thread locker and had no more leaks. so i did the same on the atrs.so far nice and quiet,no tic- tic-tic. and thay thrn a cool purple-blue color after some time.plus thay add i beleave 40 h.p. thay sure set my car on fire.i will run my car soon, and the only power add on i have is the headers(ta49 is not on now) we will see how much thay help.will post it when i run.