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==180 degree exhaust system== One thing that has not been discussed is the unequal firing order from one bank to the other. One college research paper on a Jaguar racing engine having a 105% volumetric efficiency, the torque peaks vs rpm looked like the Grand Tetons. The 1963 Ford Indy engine had the "bundle of snakes" exhaust system on the top with pipes crossing over to have 4 equally spaced exhaust charges in each exhaust header, some race car headers had pipes crossing under the trans to get equal charging in each header. This system is called a 180 degree exhaust. It has some advantages in racing situations, but for the most part it's a very difficult and costly system to manufacture, package and install/service in a production vehicle.
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