Setting up 4th gen for the 2014 World Chumpcar series. Need advise on spring(must be close to OE replacement, lower is fine, and strut (this also must be close to OE replacement). Looking at the H&R springs with KYB-G2. Any ideas, these races are usually 7-24 hrs on road course.

Good combo. Don't forget to replace strut mounts (with Moog) and OEM dustboots when you do the job.

Depends on your local course and how good the inspectors are, I know quite a few guys who have coilovers on theirs.

I would get illuminas, spray paint them black + HnRs.