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BMW 520i/530i G30/G31 Armytrix Valvetronic Exhaust System – Fresh Gear

As time goes on, emissions restrictions are forcing automobile manufacturers to use smaller and more efficient engines. Cars that used to have six-cylinder engines now have turbocharged four-cylinder engines, with more and more consumers picking the smaller engine over the larger engine. A big concern that many enthusiasts have is how the smaller four-cylinder engine…

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