I know this has probably been discussed, and forgive me if it has. I was looking at some cheap 15x10" wheels, with a 6.00" backspacing. I know I might have to grind the tie rod some, but other than that, is there any problems of fitting these wheels on the IRS? Low profile IRS bolt needed? Also, I was looking at some 15x8" wheels, but do you think those will provide enough traction at the track with some slicks on them? Thanks!