I once tried to figure out how to lower my Mustang without actually lowering it. At one time we could get Bullitt springs from FRPP that lowered the car 3/4". I thought that I could put on a taller tire that would raise the car 3/4" (radius or 1.5" diameter). That would take 1.5" of dead air out of the fender well without actually lowering the car. I decided to wait until I needed tires. By then I couldn't find Bullitt springs anymore.
I also didn't really like the tire choices. A 255/50/17 would have worked. But 18" wheel/tire such as a 265/45/18 was a better option.
Note: Stock 245/45/17s have a diameter of 25.68" so a tire of approximately 27.18" would be needed. A 255/50/17 has a diameter of 27.04". A 265/45/18 has a diameter of 27.39".
ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370.
Ret. USAF 1969-1973,1980-1996: Vietnam veteran. Aircraft maintenance. R & D, ICBM Operations.
Also own: 1997 Harley FXDWG, 1998 F-150, and 2002 Corvette LS1