BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > DIY-Make your 330i sound a little better

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      08-25-2009, 01:45 PM   #45
Derek Zoolander
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This is exactly what people do to the VW R32 muffler valve. It's called the "flapper mod."
It has no effect on performance. It is for sound purposes only.
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      10-12-2009, 10:06 AM   #46
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do we even have to take the hose off of the valve?
I couldn't take the hose off and didn't wanna break it so i just zip-tied the hose and left it in attached to the valve.
would this cause any problems?
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      01-03-2010, 10:13 AM   #47
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is everyone Else's flap open at idle? mine is open and the hose is still connected.

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      03-21-2010, 04:46 PM   #48
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I was wondering the same thing. I bought my car second-hand, so I don't know if the previous owner did something. But, my hose is still connected and at idle the flapper is open. I don't know if this is normal or not.
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      03-24-2010, 10:05 PM   #49
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Same here.. haven't noticed any mods but the flapper is open at idle too.
2006 e90 330i | Black/Terra | 6MT | ZSP | ZPP | ZCW
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      08-27-2011, 03:21 PM   #50
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Just unplugged actuator on my 07 335i. Minimal difference in idle but will keep it unplugged for a week or so to see if any change. Definitely notice deeper more pronounced tone accelerating, even with windows up and max a/c! Quite happy, got zip ties and about to zip tie the valve once i get under there and its cooler out.
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      12-30-2011, 09:03 PM   #51
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Originally Posted by montreal_bimmer View Post
looking at that video, and noticed that the 330 doesnt reall seem THAT much quicker than the 325....

deffinatly less of a difference than the 335 and the 328
NO WAY. Huge difference between the 325 and 330. I experience driving both every single week..
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      07-08-2012, 02:09 PM   #52
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Same here, does this mean we don't need to do the mod? I have an '06 330i. I'm from South Africa & as far as I know, we have RHD Euro spec BMWs
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      08-06-2012, 05:22 PM   #53
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This seems an easy mod but can someone tell me if this really makes a big difference in sound? Or I should say if its worth it to do it. Thanks
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