yea im thinken u should be able to b/c i've seen a mostly stock vr6 whoop up on a 5.0 mustang that was hooked up. but u gotta see what they all got done and the driver of the car could be a difference. but go for it. i love seein dubs stomp on mustangs.
you should definately be able to. I have a 99.5 GTi VR6 and ive raced a couple 4.6s and smoked them by at least half a car to a whole. But dont get cocky and try a camaro or trans am. Im only pushin about 200hp so if your up there then you should be ok.