Originally Posted by jesusgatos
That airbox is off to a good start! Might try annealing that aluminum prior to bending if you're having a hard time forming it?
It's steel. 16 ga. I checked and the bender instructions say 'up to 16ga'. It's from harbor freight.
The back/top/bottom peice of the airbox will be 22ga, so it should handle that ok. I'll reinforce it just on general principle.