My brother actually told me about this his friend that stay there in Colorado up in the mountains. Supposidly he has a 04 Evo with a SuperTurbo on it, he was saying simply because the air is different up in the mountains the lag on the turbo is crazy. But since he got the (im not sure of the name) lets say SuperTurbo theres no lag because the supercharger will run untill the turbo kicks in. I havent really researched into it but I could imagine what quality of Boost that'll push out