Exhaust Drone Removal - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
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The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion
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