04-18-2018, 11:15 PM | #1 |
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640xi exhaust question ?
What’s the best and most economical way to get a little rumble out of the exhaust? It’s just to quit for me..
2015 640xi
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04-19-2018, 10:02 AM | #3 | |
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Might I humbly suggest: http://www.6post.com/forums/showthread.php?t=1482200
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2014 BMW 650xi Gran Coupe Msport Black Sapphire Metallic on full black merino leather. 20" M5 343M wheels for summer, 20" 373 wheels for winter with Nokian Hakkapeliitta 8 studded snow tires. M6 CP exhaust with M6 Diffuser and ///M Performance carbon fiber finisher. Mission Performance stage 1.5 and transmission tune.
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04-19-2018, 05:14 PM | #5 |
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04-19-2018, 08:26 PM | #6 | |
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1."Luck" is an excuse for people that have failed at their mission to do something! (Allan McNish)
2. I’m not an (EXPERT) I’m just here with an opinion. So don’t hate me. (lukej) |
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04-19-2018, 08:28 PM | #7 |
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I have no idea what your talking about?
Please explain.
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04-20-2018, 11:31 AM | #8 |
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Some bmw mufflers have two outlets on each muffler. Sometimes, one of those two outlets has a valve on it. That valve opens under rpms above 3K or so allowing exhaust gases out more easily and increasing sound output. The zip tie mod involved zip tying the valve open, so it increases volume at all times.
Obviously, this only works if your exhaust is valved. Google "BMW zip tie mod" for tons of details and pictures. I don't know if your car has a valved exhaust or not. If you take some pictures of your mufflers from underneath, particularly where the pipes exit the muffler, we can easily tell you.
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2014 BMW 650xi Gran Coupe Msport Black Sapphire Metallic on full black merino leather. 20" M5 343M wheels for summer, 20" 373 wheels for winter with Nokian Hakkapeliitta 8 studded snow tires. M6 CP exhaust with M6 Diffuser and ///M Performance carbon fiber finisher. Mission Performance stage 1.5 and transmission tune.
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04-20-2018, 02:01 PM | #9 | |
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I really appreciate the explanation that helps a lot thanks so much .
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04-22-2018, 01:26 AM | #10 |
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No valves for the 640i.
I put m5 mufflers on mine with one of the valves open (having both open has unbearable drone - based on some threads on the f10 forum). It's a bit on the quiet side but is a definite improvement in sound and looks. |
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