I’m planning to buy an M4 and looking for suspension advise. I used to own a 66 Corvette with IRS and I liked it. Would an IRS suspension really be that much better in a Cobra than a straight axle if I’m just doing street driving? Also, I much prefer the look of taller sidewall tires with 15” wheels. Is it true that an IRS suspension won’t work with 15” Halibrands? Thanks for any input. Tom