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I recently bought the DesignTek Valvetronic exhaust system from Design 911. Unfortunately no installation-instructions were included. I've emailed Design 911 about it, but after 1,5 weeks they haven't made any progress. The only email-address I could find for DesignTek was email@example.com, but emails bounce. Then again, how hard can it be? :P I've installed the mufflers. They sound great but the default mode is LOUD which isn't always so popular amongst the neighbors. Each muffler has a single vacuum-valve that closes the flap with vacuum present. The kit also included a vacuum reservoir, an electronic valve, a one-way-valve, a box for the idiotic remote control, keyfobs, a length of hose and various fittings, strips and cables. I have the Porsche factory PSE-switch for use with this and hooking up the electronics is easy. The vacuum though, not so much. I found a place to tap into the vacuum-system, on a valve on the back of the intake, left side. Not sure which side of the valve I should hook into though. Then there are the tank, one-way valve and electronic valve. I've tried to apply logic and came up with the following: Vacuum from car || \/ One way valve to prevent the vacuum tank and mufflers to feed vacuum back to the car in low-vacuum situations. || \/ Electronic Valve || \/ Two t-junctions to feed three hoses // // \\ // // \\ Mufflers Tank Electronic valve The valve either allows vacuum to pass through (power applied) or dumps one side of the valve to free air (power not applied). So with power on it allows the car to pull on the valves on the mufflers, and with power off it releases the pressure and the springs in the valve pulls it open. Sound good or did I miss something? I'm at vacuum 101 here..