Ahh hah, thanks.
1)You don't need a "performance" airbox. Puch airboxes are easy to derestrict. To clean, you cut along the sealed edge with a straight razor. It's hinged on the bottom so don't cut there...just where the rubber sealent material is. It will pop right open once you cut it....Then you will see the actual metal air filter inside...spray and soak it in brake cleaner...brake cleaner dries very fast. The box will pop back together, you don't need to reseal it.
2) You don't need one...Just derestrict the airbox that you have...Take the white hose off...you will see a small hole...through the small hole you can see the air filter. That small hole is actually part of the restrictor plug..stick a screw driver in there and pop that bad boy out. Then the hole should be the same diameter as the hose. Doing this, will lean out your mixture, so you will need to buy a bigger main jet for your carb. You can put the white hose back on, after you take the plug out...if you want too. You don't need it. I think it is there for some restriction, as well as noise reduction...?
3)There isn't a fuel filter in a bing carb, So I am not sure what you mean on this one.