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Finally got around to doing this mod last night. I tried 3/16 vacuum line caps and they were too big. However, 5/32 worked perfectly on my 2009. Took me less than a minute once I got the right sizes. Anyway great little mod. Gives the car a nice deep sound below 3000 rpm. I should have done it a long time ago.
BTW I decided to use the vacuum line caps and plug rather than the zip tie because I didn't want to cause the line to crack or split in case I want to go back to stock. With the caps and plug it will be easy to reconnect later if I decide to do so.
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2009 BMW LeMans Blue 135i/Dinan Stage 2 tune/Alufelgen SF-71s/M3 suspension components/Koni Sport adjustable dampers/ETS FMIC/M3 paddle shifters/Alpina B3 TCU flash/VRSF charge pipe
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