Was wondering if anyone knows what is the exact offset/width/sizing of the widest wheel and tire combination I can get under the rear of my 996tt with Todd's Protomotive intercoolers installed.

I seemed to have a lot of clearance issues on the inner wheel/tire against the piping of the intercooler with my HREs which were custom built to fit 315 rubber, but were OK with my Techart Formula's using standard 996 offsets (19 inch, 10J, ET40). Problem is the Techarts can only run at most 285 tires.

Wondering if this is unique to my car as the piping may have just been positioned incorrectly by my mechanic.

Thanks in advance.