free DIY better flowing stock exhaust.
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free DIY better flowing stock exhaust.
Allright, for those of you that can't afford an exhaust system yet, this DIY is for you. As we know that Evo exhaust has a flapper door inside the muffler to control backpressure. The door opens at higher RPM. So, why don't we keep it open for better flow? Here's how! Keep the flapper door open with a long screwdriver. Take a drill, and drill through the muffler and the door in a straight line. Finally, attach a screw to the muffler and the door to keep it open. That's it! Now, this is just one of those , you're bored as hell and have nothing to do project. For those of you that has **** to say about this, please keep it to your self. Just trying to help!
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