If the back wheels are spinning at a different speed than the fronts it will trip your abs and traction control. 275/45/17 will be noticeably taller than the stock 245/45/17s.
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2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.