Good luck competing again the AMG or the M of BMW. The new M5 with it V8 twin turbo is out of control and then AMG take to another level, 5.5L V8 twin turbo. With only minor mods like dp and a tune both of these monster already run low 11's to high 10 sec 1/4 mile.
If that still not enough, AMG also makes a V12 twin turbo. The limit is your check book.