why don't they put twin turbo's on cars to increase low end and high end power, and to stop turbo lag?
they do some times. its called a sequential turbo set up. what it is, it you have a smaller turbo that spools up very quickly at low revs, and there is a larger turbo (thus more lag) that comes in a higher revs with more flow. it is possible to tune these turbos to various boost levels, but in relation to lag time. the mark IV Supra turbos used a setup like that, actually