hi, well i have a gti turbo & my bestmate drives a cupra r, the cupra has the ko4 as standard and is 210bhp on his as standard, the differnce is awsome so i would say that 1, and i think its a direct fit! i am also thinking of a turbo upgrade and that is what i would go for, there was a brand new one on ebay for £550, i know the cupra comes standard with 2 intercoolers and gti's only 1 so might need to uprate the intercooler??? but a chip would prob be a def and also uprating the brakes! So an expensive job but iwould say worth it! Whats your Gti running at the mo?? any other mods??