Road course driving, autocrossing (HPDE/HSAX/AX), etc... should absolutely be noticeable... think of the weight reduction (vs extra weight carried) compounded at high speeds (~30-40-50-60-70-80-90, etc mph)... not just accelerating, but especially during breaking and cornering... its all physics... less weight = faster response in all actions. The breaks and tires/suspension will favor less weight. I'll re-confirm and tell you in a cpl years when I hopefully install my aluminum heads onto my new SB.

Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!