Depends on the intake I would suspect. A much more free-flowing intake would probably require a bigger MAF as well as injectors. Now, wether you'd be able to get away with just a bigger MAF for now is another question, and I'm not completely sure of the answer. If I had to hazard a guess, I'd think that running a bigger MAF with the same injectors might cause you to run a little lean. Just a guess though.