2015 Mustang Ecoboost K/SA?

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Originally Posted by Ben Holt

I don't know how much money you want to put into this project but Carlyle Racing makes a 15" conversion kit to allow the use of a regular sized wheel. Pretty sure the kit is bolt on so it would be Stock legal. This could be an option so you can run a 15" diameter wheel and tire combo, at least in the rrar

Not seeing that on Carlyle's web site.

Baer has bolt on brake kits for the front and rear of the S550 Mustang platform, that allow 15" wheels front and rear. Baer's kits are about $900 per end, and the rear one has no provisions for a parking brake. They claim their brake kits will save a bunch of weight. I think these cars will comfortably run under their current index(es) with the stock brakes (although I would avoid the Performance Package car because of it's even larger front brakes).

Alan's probably got the right idea- a set of drag radials on the stock rear wheels, an off-road down-pipe, a "tune", install the required safety equipment, and it should run under anywhere.