some people like to totally mutilate their airboxes and attach pod filters properly (to keep the MAF housing and whatnot)

My airbox has a MAF housing, so wen i took it out and put a whale penis there, it gave me CEL - you'll have the same issue by the looks of things.

i think ur fuel efficiency won't be that bad, but then again, why'd you buy a city in the first place?

engine warranty: yes you can swap it back, but if you had a CAI and hydrolock, theres really nothing you can do..