i think you don't understand what i mean you need a engine that will rev and make power all the way. you go faster at the drags if you get off the line fast you need lots of tracksion and have a turbo that make power later than 4000rpm this will bring the top mph up, it wont be fun to drive on the street as it will be a lag monster but at the drags it will be fast, the standard turbo motor will not top end very well so it wont rev so short sifting will make it faster,, if you change at 5000 it will feel fast and will top out at 110mph