Most people run 9.5 & 10.5 or 8.5 & 9.5, what are the pros or cons of running 8.5 & 10.5?

 

a couple auto-x and maybe track days next year, so I want something that isn't just straight line performance.

 

Im running 8.5 on the front and 10 on the rear. 245 front, 275 rear S03's.
with the swaybar, strut/shocks/spring rate, and alignment settings i can induce
over steer at command while the car is very predictable and neutral through
fast turns.

toying around with swaybars will net better turning behavior of your car
than playing with wheel width alone.

 

Can the coupe take a 9.5 in the front w/o fender mods? What offset would you recommend, +40? I'd be interested to put 9.5's upfront if I could. Thanks.

 

+40 offset up front would be too high for a 9.5 inch wide rim. I have the Brembos up front and have +20 offset with plenty of clearance between the wheel and brake caliper. I would tend to think that in the +20 to +26 range would be sufficient (approximate) to clear the Brembos. Try doing a search on what some folks are running.