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dudutzu - the 8 gen headers pair the same cylinders as the 5 and 6 gen headers. The only difference is that on the 8 gen, the front two primary tubes are shaped differently to fit behind the front-mounted radiator. 5 and 6 gen have side-mounted radiators. If you've got an 8 gen, check out the 'Full Exhaust System' thread in the 8 gen forum. It is directed at the 8 gen headers and summarizes this header thread in a couple pages, including dyno charts [So you don't have to read through the 41 pages of data that's logged here]. A better summary statement was never made. Thanks for the detailed article Greg - you rock, always have. Right on!

You can also see from the drawing that in both cases (both the 180 degree crankshaft engine and the 360 degree crankshaft engine) the primary headers are on cylinders that provide the widest possible spacing of exhaust pulses into both the primary "Y"s and into the final merge (the "collector"). This is how you arrange things for good gas flow through an exhaust system.