This isn't a drag car that I'm going to be launching at 6,000 rpm, Mad Dart. As a daily driver,I really don't need a lot of sidewall flex. This turbo doesn't kick in until 3,200 rpm, so unless I mash the gas pedal doing 70 on the highway, wheel spin isn't a concern. Besides, if I take it to the track, I can always switch to 15's with more sidewall.