Is your car mini tubbed or the wheel openings trimmed? 15x7's is about as wide as you can go without modifications. Probably 15x10 with a mini tub and the right size tire.
No, not mini tubbed or trimmed. I have 15x8 with 4" BS with 275 60R15. I went with 15x8 instead of 15x7 so there was less sidewall bulge for clearance. Fit very nice with stock suspension, but I now have SS springs so it is quite tall.