The stock 19" track wheels and the Potenzas are not exactly lightweight to begin with.. you dont have to go to the super expensive forged wheels to save some weight. IIRC my varrstoen 3.3.2 with Hankook V12's are lighter than the stock track setup (although not by much). As long as your aftermaket setup is lighter or same weight as stock, your acceleration performance will not be "reduced".
I have seen on other threads that you are determined to run 19" front and 20" rear. My concern is your tire size. According to various tire size calculators, switching from 245/40/19 (stock size) to 295/35/20 (your listed size) is a 5.02% difference, and this might throw off the traction control.
A better size to run will be 275/30/20, and that will only have a 0.83% difference in overall diameter. Also, a lot of people generally agrees that 275 is a good size to run on a 10.5" rear wheel. It will not be stretched, and you dont have to run crazy camber to make it fit flush with the rear fenders.
Good luck.
I have seen on other threads that you are determined to run 19" front and 20" rear. My concern is your tire size. According to various tire size calculators, switching from 245/40/19 (stock size) to 295/35/20 (your listed size) is a 5.02% difference, and this might throw off the traction control.
A better size to run will be 275/30/20, and that will only have a 0.83% difference in overall diameter. Also, a lot of people generally agrees that 275 is a good size to run on a 10.5" rear wheel. It will not be stretched, and you dont have to run crazy camber to make it fit flush with the rear fenders.
Good luck.