I could use mandrel bends, but then the exhaust will be just like everybody else's. As far as flow is concerned, I wouldn't do a pie cut turbo manifold or a pie cut headers for a high strung tuned n/a engine. These are for Harley's, most Harley's are good with a little bit of back pressure. The...
Without giving away too many secrets, I weld each joint completely before moving on to the next one. I have a few things that I do to guarantee zero movement while welding. I've been doing pie cuts for a long time now and it's taken a lot of different approaches and techniques to find what works...
Thanks man, I've done a few pie cut exhausts lately, they are a ton of work. Luckily I enjoy doing the prep work just as much as welding, so these are pretty fun for me.
Always bolt your flanges down tight to some sort of heat-sink when you weld them. I have about 10 different 1" thick pieces of aluminum with different bolt patterns drilled and tapped in them just for welding flanges.
If you use a gasket, use some type of universal gasket material or even some...