Oval exhaust tube experiments. Nascar boom tubes(Advice needed!) in Tips, Tricks, and Tutorials Posted November 1 On 8/26/2021 at 8:49 PM, Chariots of Fire said: Take some brass tubing, put in a vice and squeeze. It'll come out pretty close to what you want. Aluminum tubing would also work and you would not have to paint it.😎 This method might work. There's two things that I can think would be issue. First, you have have something to protect the pipe in the vice. Otherwise you could have nasty marks in your pipe. Secondly, some kind of spacer or stopped would be required to make two identical oval tubes. Thirdly, what if you like a bend in your fresh oval tube. How do you make that? Also how to attach oval tube to reqular round exhaust pipe? I'm in for all kind of advices and tips. I like making custom exhausts to my models and I like to make them "realistic". At least the tips need to be hollow.