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Can someone tell me what these are for and where to find them? I have a fail error on my MB diagnostic computer. SLK55 AMG
 

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Just before the exit point of the exhausts, designed to give enhanced sound. Variable opening from 2500 rpm upwards I think, fully open at 6000.
Usual fault is a motor failure, £600 at main dealer, needs programming with DAS/Star. If you turn off the engine but leave the ignition switched on you'll hear the motor cycling trying to reset.
TonyS
 

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The flap motors do seem to be a weak point on the car. Mine are ok at the moment but I did have one replaced under warranty a couple of years back. Somewhere on the forum there is a thread about exhaust flap simulators that plug in instead of the OEM flap motor. They trick the car into thinking that the flaps are fully operational so no codes are thrown. They seem like an alternative for anyone who wants the flaps to be permanently open or replace the rear section of the exhaust with something custom. Haven’t tried them myself.
 
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