How good are Modular mustang racing heads? Anyone running them? Looking for a reasonably priced head to go with the vt stage 1's I just purchased. Im leaning toward's fox lakes stage 1's, but they require the originals be sent back to them. I know MPH heads are top notch, but they are about 2g's...D.S.S, Livernois are also pretty good, huh? Any reccomendations?