I was just reading through a few other posts, and I was recalling my experience with some of the topics. I have had quite a few aftermarket components on my car. Some are still there, some are gone.
I am pretty happy with everything I have on the car now, but there are a few things that I was not very happy with at all. Here are some of the things I will never buy for a street car again:
-AJE K-member
-X2C front coil overs
-Kooks Longtubes
-Steeda IRS bushings
The AJE k-member relocated the power steering rack/lines right into the oil filter. Required bending the power steering lines to a point where they were nearly pinched. Also, the bushings at the fastening points for the a-arms had so much play, the a-arms would slide back and forth.
X2C coilovers made the front suspension clang and bang due to lack of rubber/poly isolators between the springs and strut towers.
Kooks longtubes hang too low and don't seal up properly at the collectors. The exhaust system leaked until I removed them.
Steeda IRS bushings offered no reduction in wheel hop.
What products have you had poor experiences with?