The R is not as formidable as a car as the Z06 IMO. A production stock Z06 with amenities that is confortable to drive is (and everyone can agree here) extremely close performance-wise to the R, and costs less. The R is a track only freind in reality, even if it is street legal. It is not the daily driver the Z06 is. Additionaly, the R had 385 hp yes, and the Z06 I beleive originaly had 385. Then they upped it to 405. The Ford is out classed here. Additionaly, the R is not a bargain as Mustangs go. The new SVT is about as fast in a strait line for ever so much less. I think putting the iron block with blower in the R would make it a better car, considering it has about 420hp at the crank. Some chassis tweaks for a different weight and viola, a Z06 killer. But it would still be rather expensive.