Hey there, well I think I can finally get my straight pipe on, I have found some tubing for free, my farmer that I prime tobacco for has a bunch of irrigation pipe, and I asked him about it, and he said that I could probably have some of the shorter peices (about 8 feet) If I wanted and If I wanted a long peices (20 feet I think) that they are only like $30 or $40. He has some different sizes, mostly five inch I think it is, which is what I was going to run. I am pretty sure that it is aluminum. Anyways I was wondering if this pipe would be okay to make an exhaust out of, I would have to buy the DP from some company, then a 4-5 reducer, and some elbows for going over the rear axle and I should be good to go I think. What do you guys think?