::: Thumbs ::: Next >> ::: 1. Experienced fabricator cutting up the stock Opel/Vauxhall Kadett GSi 4-2-1 stainless steel exhaust manifold. Cutting it up, rerouting it, and welding it all back together is the plan. Using the original lengths. Apparently, the stock exhaust manifold is good up to about 220hp or so, so it should flow enough for me for awhile at least.