Or maybe, having forked out a couple of hundred pounds on parts you realise it makes sense to spend a bit more to make sure you are seeing the full benefit of the modifications. You should improve your mpg.
Also, that beast of a 998 is likely to benefit most - a little more power is a much more significant gain on not very much.
Don't get me wrong, I would love to have fuel injection! The ability to be able to map the engine so it's performing 100% throughout the rev range is awsome, but I just can't afford it. Now anyway.. Anyway, when the engine gets its KAD upgrade, it's going to get injected