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Originally Posted by mynewx1
Just a question for those of us who already have the car. Driving behind the car I noticed the right side exhaust looks different from the left side. So had a closer look and seems that the right exhaust has a metal flap inside it. Does anyone know when that opens? Full throttle, or Sport mode? This is the petrol 25i engine.
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You're probably a first time BMW owner. This exhaust flap has been in BMW cars with dual exhaust pipes for years. The flap is intended to provide enough back pressure for more low-end torque when you run at low RPM. If you pay attention to it when you warm up the car in the morning, smoke only comes out from 1 pipe. When you rev up, it opens. This flap connected to a little hose that blows or sucks air for open/close mechanism. Look under the car and you will see it.