I already want to put wider tires (315 or 335) and upgrage to 17" rims on my soon-to-be-mine 2000 SPF that already has Wilwood brakes. Won't be autocrossing or road racing, mostly weekend cruising redlight to redlight. How do you measure backspacing and determine what wheel do you need? Any SPF owners have this wheel/tire combo? Don't want the tires to hit the fenders. Any adjustments to the shocks needed? Are Trigo's the wheel of choice? Thanks for any help anyone can offer. Garage is clean, get my baby in 3 weeks and I already can't sleep!