Dual Exhaust System for tC?
Years later just wanted to add, unless the car is Turbo charged, the dual exhaust thing is a bad idea on any engine without either a (split Header 2x2) or a V engine where you have dual headers.. Because you will loose back pressure, and thus lose torque. You don't want to lower the torque rating because ultimately your off the line 0-whatever speed will be reduced. You can also cause excessive wear on rings etc.. Just not a good idea..
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