GPHeaders was able to supply a set of 180 degree headers to retroformance for their M6GT replica that was featured on Gearz with Stacey David. Typically these bundle of snakes are seen on GT40 kit cars but they also ended up being a good fit for this build and its 600HP Jon Kaase SBF. https://www.gpheaders.com/shop/gt40-headers/302w-351w-180-degree-header-gt40/