Again, I will continue to back up Ground Control + Koni yellows as an affordable, competition-proven coilover-sleeve adjustable suspension system. While the spring rates they come with stock (350F/280R ?) may be "similar" to comparable systems' rates, Ground Control uses Eibach Springs.

The original poster probably isn't going to be doing serious racing, but you may as well go with something that thousands of autocrossers and competitors use every weekend.

I had a very negative experience with OBX, so I'm biased with regards to that view.

Shingo