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Yeah that's fine if you only want to pump air or just get a big kw figure, but a car DOES have a chassis, trans and wheels etc. and the point of the engine is to turn those wheels, and its how fast it can turn those wheels that we are concerned about, otherwise we'd just leave the stock exhaust on. So if the exhaust is so big that the engine don't turn the wheels fast at low rpm, then that's bad. mmk.
Its fine on the drag strip to produce high end power but for the street we have to consider low end torque. I'm big on this, because everyone (including car manufactors) can forget it in pursuit of big numbers. Just remember bigger don't always mean better, even with turbo cars.
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