I ordered Bilstein's threaded coil over kit from Summit Racing (Part #: BSN-193117 only $59.99) and I will be trying a range of springs between 300-400lb rating. I would like to know what free length to order. I believe it is around 10"...but would like to verify with you guys that know for sure. The kit will utilize a 2.5" perch. Summit Racing has a crap load of springs for about $50 a set. Any experience with Summit's QA1 springs? Or other recommendations? I'm trying to get my car prepared for the track.

IIRC it's 8" of free length, but I'm sure others will chime in soon