Turbo inlet 4" tube and filters

["Mad Max"]

I just picked up a 93 Cummins and I want to remove/replace the factory air box/filter/turbo inlet 4" 'tube' with a cone style K&N 4" filter and 4" aluminum tube. Basically I want to upgrade the lungs all the way up to the turbo inlet. Is there some place that makes a nice clean double 45 degree replacement aluminum tube? The filter and rubber connections are easy, but the tube is the kicker. I'm going to make custom mounts for it on the filter end, and with the rubber connectons there is no worry about the filter "falling" off.

Anyway, that's what I'm after. Thanks y'all.