i second the monster tower but when we buil mine we used a powered electrical conduit bender with 2' tubing. we rented it for 75.00 for the day. the rental place had two types with diferent sizing. i cannot remember if the one we used said emt on it or the one we didn't take. those benders make a little more progressive bend since aluminum will flatten on one side and split on the other if using muffler shop bender. some guys will just use 2 inch exhaust pipe and get bent at muffler shop.
Thanks for the info. Why do I need a tubing notcher? Does any one make a 3" version, I do a lot with imports and custom turbo setups so one that can do 3" as well would be great. thanks for everyones help!