I am running a COBB as well, I have never run it on the track past stage 1. I have also never had an issue with over heating...I do pull the cowl off though. I would recommend the COBB AP and a good FMIC.
Funny I am heading to Sebring tomorrow ^
I run carbotechs w/ titanium shims to protect the weak brembo non SS pistons. Haven't decided if I am going to upgrade the OEM brakes or swap to BBK.
/// AST-SWIFT-Vorshlag / M susp. conversion/ VM adj. toe links / Maddad Whisper exhaust, BERK mids / Cobb AP / AR catted DPs / HPF FMIC / HPF OCC / BMWP-SSK / AA BOV & CP/ Breyton GTS-R, APEX ARC-8s / Wavetrac LSD/ BR Racing Harness Bar / BMWP Elec. Wheel V2 / P3 gauge / Musicar /