I had the pin break on my old 228 before I traded it in. I bought a new one for $8, but I couldn't ever get the actuator to stop in the right place to line up the new pin. The dealership also quoted a hilarious $90 to install it. I ended up just wrapping a bit of wire around the flap to keep it open at all times and that worked just fine for me.
My M235 has the M Performance Exhaust and I hear the flap rattling a little on startup, but once the flap is open I don't hear it at all. At this point, I think I'd prefer that there was no flap to begin with.
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