how much hp would it have if i intsall a turbo kit in it

335 is Bi turbo!!!!
what are you asking here? go to Edmunds.com and read the specs first .
I agree with several of the comments here. to modify a great car like this is simply stupid and a waste of money.
you want a car with even more performance, well get the M6 of M3 or a Porsche, MB AMG. you could also look up Breyton or Schnitzer tuning, they sell modified cars with enhanced performance.