PSA: Check your exhaust butterfly flap.

I noticed recently that my car sounds like a Jet when I step on it.



Yesterday I spotted a thread here that indicated that the flap should be open with the engine off. So I decided to check mine.



It was stuck in the closed position, restricting the exhaust flow.

I've sprayed mine down with WD40 and will be trying to free it up this evening.



I will report back if I notice any change in performance.