what are the widest wheel and tire combo that will fit under my ss slp car?

 

depends on the ride height and backspacing of the wheel. If you have stock ride height you can push the tire outside the fender well and go wider. But for a pretty much stock wheel, you can go 17X11 with a 335/40 tire. I would check with a tire shop before you do anything, they can tell you exactly what you can do.

This is just for the back BTW.

 

i run 17x10.5 firehawk rims that were widened on my Firehawk and it has strano springs and adj koni springs and have never rubbed and have 0 problems.