Mcmaster-Carr also sells pipe bends. we have used these on several applications for tight bends off the compressor housing. they are defined as "butt-weld fittings". you can get them in Schedule 10 which mates up well to most turbo outlets. going to need it to be aluminum as well.
they are pretty good on pricing and ship out next day (same day if you purchase by 3pm).
Mcmaster-Carr, if you dont already know, is a great source for just about everything you could possibly need for any job in any industry. search away and call them if you have questions. they are very helpful in my experiences.
brett