stock airbox replacement

[shadog37]

Hi. I am new here. Thanks for having me. I have a 2014 tao tao 50 cc atm a1. Its all stock still. I bought in late july 2014. It now has 2500 miles on it. It currently goes 50 mph. Very fast i think for a 50cc. I mean my neddle pegs all the way down. I broke in very slowly. Changed oil like 6 times Already. Put in iridium plug. Only thing i changed so far. My Question is can i only replace that bulky black air box with a 12$ one i ordered off ebay. Thinking this will maybe give me 5 more mph if engine can breathe that he wat it should be. Do i have to mess with idle or a/f mixture? Thanks everyone