Yeah it was a huge difference. He did the whole top end kit (heads, cams, etc) and with LTs, CAI, 70mm throttle body/plenum and a good tune he made 378 at the wheels!! And the car pulls like crazy all the way through the powerband now
I wouldnt go with the mmr ported ones. That extra $500 can be spent on something that will be better for him. The only way the ported ones will help is if he is revving the car up way past 6000 (which im sure he isnt). On a basically stock motor he will never be able to use the extra air flow. AND i would NEVER buy the one from MMR because it is nothing more that a mild hand port. They dont even have flow numbers for them!! If for some reason he would be crazy and decided he wanted a set of the TF heads ported then Nick at Modular Head Shop is the ONLY one i would go to.