If you are looking to track often, then you might want to re-consider going SC, they produce a lot of heat, and I have yet to see someone track a SCed e46 M3 on a REGULAR basis and not having any heating issues.
My vote goes to the VF kit if you are going to get one.
Also, check out M3forum.com. The SC topic as been beaten to death over there. Use the SEARCH function to find all the info you want there, anything you want to know has been discussed on that board.
SuperM3 is right about Cross. I have seen a few kits done there also.
2008 AW/FR E90 M3
//RAC RG63//Volk TE37//AP Racing BBK//Akrapovic Exhaust//Dinan SW//Dinan Intake//JRZ RS1 Coilovers//Dinan Monoball Control Arm Bearings//VRS Diffuser//
Last edited by STALKER; 10-26-2007 at 10:58 AM.