Here is an old pic of my setup. I actually do have the intercooler in now though. It's a 3 inch pipe, the supercharger inlet is 3.5 inches. I think most Vortech power pipe setups are a half inch over the supercharger inlet size. In other words, I should have a 4 inch intake pipe. I'm not 100% sure I could make anything much larger fit, I had to remove some metal to get the 3 inch pipe to fit.
If you can't fit a good intake I would suggest using AT LEAST a screen. I think in my case, too small or not, I greatly benefit from it being a cold air intake.
On a seperate note, when I had my car on the dyno BEFORE replacing my way to restrictive exhaust, it did not make any more power with the intake off the charger. Now, with 2.5 inch exhaust, it might be more of a restriction than it was.
I had nothing but problems with my MAF sensor until I finally got rid of it! I actually about blew the top off of one. About half of the sealer was broken. But, I tend to doubt that the small leak you have from your sensor is costing you much boost.
KC