think of the lag? no actually look into how those sts turbo systems work there is really no lag at all, and it is cooler air flowing. they are a good system i have seen them on different vettes and such where i live, they make good power and a nice sound and no don't be worried about the lag for one i have ridden in a car with this turbo kit and im telling you there is no lag, also ground clearance yes that is the only concern i would have, but when done right and put in the right spot it will be fine, but for the crossfire good luck getting a tuning solution so it really doesn't matter.