I'm curious to get he full story on handling... I agree that it shouldn't have an effect, but you never know what interactions are taking place. For my next DE (weekend after next) I had planned on leaving my rear seats at home and stacking my track tires in their place. I could leave the seats in but then I can't see out the rear window.
2008 M3 Coupe | 6MT | Interlagos Blue Metallic | Silver Novillo Leather | ZCW | ZPP | ZTP | 19" Double Spoke | HD/Sat/PDC