There would be plenty of room for a meth inj. kit. I am getting one really soon also
Plus ive seen the assue's cars dyno but im not sure what KW to HP conversions are.
I have seen many cars utilize air to airs on roots blowers, just surf the miata forums yes I know miata's suck but they do it also. They have been experimenting with throttle body places to get the lag down . For sure the maff will have to be relocated closer to the intake on the piping coming back to the intake, cuz thats were most of the tuning problems come from. Once the maff is relocated then alot of the florring and your car about falls on its face stops.