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KillerBMotorsport · 08-09-2022, 08:24 AM

Those flap valves should never be used on a horizontal surface. They sag open, eventually take a set and become non-functional, and can even fail. Especially the cheap ones. Not how BMW (the original design from back in the 90s) intended for them to be used.

08-09-2022, 08:24 AM	#568
KillerBMotorsport Join Date: Apr 2021 Drives: BRZ Location: Virginia Posts: 568 Thanks: 89 Thanked 711 Times in 325 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Those flap valves should never be used on a horizontal surface. They sag open, eventually take a set and become non-functional, and can even fail. Especially the cheap ones. Not how BMW (the original design from back in the 90s) intended for them to be used.