Difference between A9L and A9P Mass air computers?

[DRASTiK]

Well, technically speaking, the A9P will have more aggressive timing and fuel curves than the A9L, but it's not really a big enough difference to matter. Either one will be fine. I have an A9P in my 5 speed, but that's just because when my first one died, that's all I could find at a decent price.