the company is down in KY -called Processing Equipement Inc’, they do ally up to 10" allsorts of bends and pipes, the stuff I’m using is .065" wall Vacuum tube. They sell this trick heat shrink couplings that you just put over the joint and heat it up with a hair dryer- it’s on the intake side so no pressure to deal with.
Next is the K+N RC3070 air filter and we’re ready to rumble!