Damn, go on ebay, buy 3 inch stainless mandrel J bends for 26 each, go buy 10 feet of straight 3 inch mandrel from a local shop. Then use a metal chop saw and cut and tack the pipe with a MIG. Do it in about 2 or 3 sections so you can dissasemble to have it TIG'd by a pro for $100.00, get the ends spread at midas muffler in a couple of spots so it will slip in and you can adjust as needed. The areoturbine costs 170. So, for about 600 or less and some sweat you can have it done just about as good as a pro - maybe better.
eBay Store - Mandrel Bending Solutions: Silicone Hose Products, Straight Pipe, 45 Degree Bends
You can get everything from these guys to set it up. You will also need a flex section and possibly a 2.5 to 3 inch reducer.
Veyr easy to do - 3500 is retarded - I'd consider that an insult if someone quoted that to me - or it had better come with a turbo (installed).