Marc:

You know that it's very easy to modify the C55 handling for that additional "15%" without sacrificing ride, if any at all. 19" wheels and tires will do it (only +1 size) or even better , H&R or Eibach Pro springs. Progressive rate springs only drop the vehicle ~1-1.5." KOni Struts/shocks could take you a step further.

Even milder though significant, front strut tower braces and rear tower braces if available.

 

I am looking into a few mods now possbile exhuast and suspension that should do it....how is the 55 treating you?

 

"Hyundai like." Yet he owns an S2000???? have you seen that interior? Granted- it is much cheaper.