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UPDATE IV: Exhaust Drone - X-pipe flute?. See Post 72 - Page 5 - Rennlist - Porsche Discussion Forums
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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Soul Performance Street Package Non-PSE Performance Exhaust System Anti- Drone Black Chrome Tips S Model Porsche 991.2 Carrera 2017-2019 | POR.9912.ESX.BCS
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Problem - Exhaust drone: Solution side branch, aka 1/4 wave resonator, or Helmholtz resonator| Grassroots Motorsports forum | | Drone, Exhausted, Solutions
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