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Too many people believe myth, rather than facts. Myths such as the back pressure claim, if its cold turn your lights on to warm the battery (particularly funny one), the old myth about not leaving a battery on a concrete floor, etc. Jim

Watkinssr had it exactly right. The answer depends on the engine design. If you take an engine with a lot of valve overlap and open the exhaust, you will lose a lot of power and the engine will run poorly. On most stock street engines opening the exhaust will do nothing except make lots of...