I say aftermarket because you get more bang for the buck, and can have it done how you want it. You can replace it with something smaller and have it do a good job too.

90 amigo 2.6 4wd calmini cam and header
Junkyard Rancho 5000's.... Lifetime warranty right?
Amigos don't run on gasoline,
They run on Love... <img src="/forums/images/graemlins/smile.gif" alt="" />