Twin Air = None better IMHO.
On two seperate bikes, the UNI's I got were a little on the Too Big side.
Poor Fitment on 1983 YZ490 and 1972 DT2MX.
Oh- and Don't use UNI oil, it will be found in a puddle on the garage floor
the next day, in So.Cal heat.
I just want someone with staying power to start making filters
out of pleated Gortex Material, like the shop vac filters you can now buy...
Like a K & N , but would actually trap dirt, unlike a K & N) Rinse 'em off with a hose and let dry: GTGo