So far so good fitment was right on and pretty easy to install. The quality ot the header was stainless steel and seems pretty durable. Will see how long it lasts. Oh I forgot to mention it went on a 2001 z24 cavalier 2.4l. As far as a difference in power about 1000hp more than stock. Nah just kidding I hooked it up to stock piping and muffler so it only seems to be a bit more responsive and torquey on take off. But i have not floored it. I only did this for a HP or 2 and to see if it improved a mpg or 2. It has a slighlty different sound outside at idle and rev and a definately different sound while cruising on the interstate in the cabin. Overall I say it was worth it so far.

Nice

99z for 2015.. I'm back bitches

I'm interested on mpgs gains if there any with headers