Only M272 and M273 Non-Turbo Engines. The intake manifold swirl flaps are unique to these engines and give you some of the same performance as a turbo without the heat. https://mercedessource.com/store/search?keys=swirl%20flap. Better acceleration and smoother power curve. BUT you must make sure they are working properly. I will show you how to test, then show you what breaks, and then show you what is required as a lasting fix.
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