fast intakes and TB's?
 

do you need a 90MM lid, MAF, and bellow to go with a 90MM fast and 90MM throttle body?

Nope. I'm running the stock MAF and even the stock bellow on my 90/90. The normal aftermarket lid is about 90mm ID, so when you run an 85mm MAF and a coupler (instead of sticking it inside the lid), you're pretty close to a full 90mm setup.