nope... your emmisions will be totaly farked, as there's much more air flowing through the turbo.
as for "how do the high powered cars get around car without being defected" questions... simple answer is they don't... they sit in a workshop most of their life and come out once in a blue moon for a show/dyno posing/sponsored hektik event/Track day (get there on a trailer)
most folks who can afford to spend the required amounts will usually have something much more comfortable for cruising...
Why do you want so much power if all you wanna do is cruise? honestly, it seems like a waste. Aim for 250rwkw, it's a lot more fun and useable on the street... as someone said before.. with a big turbo, you'll spend more time getting it to make positive pressure than you will actually enjoying it... and when it comes on, hope u know what u're doing...
lag... lag.... lag..... boost/wheelspin/holy sheet/lolwall