Lol, thank you. One more bit of info Ive picked up on the difference between the 2 heads (which may be in that link, i cant remember now) is that in stock form the GSR is better suited for a turbo application. The reason for this is the chamber shape. The flat faces in the GSR chamber aid air flow in boosted applications. Im not sure how big of a diference there would be, so for all I know the difference could be even more minimal than the flow rates. Deffinitly worth checkin out for anyone interested in knowing more tho.