2008s vs 2009s
While at the dealership picking up my splash guards I learned some very interesting things from one of the ASEs. There are a number of differences. They showed me the '08 exhaust system which had just been replaced with a MagnaFlow system. It had these things they called suit cases just after the cats that the '09 do not have. The '09 also have beefier axle housings that have forced MagnsFlow and Borla and the rest to reconfigure their '09 setups. The '09s have definitely been re-enforced over the '08s.
I also got an up close and personal with one of the Speed Factory test mules with long tube headers, Cam, ECM and MagnaFlow system. The car was putting over 450 to the wheels. O M G!!