04-20-2022, 02:17 AM | #1 |
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Thinking of buying the MPE backbox for my 335i
I do really like the sound of my 2015 335i F31, although with windows closed it's a touch too quiet perhaps, hence me thinking about the MPE which is just a back box it seems rather than a whole system. I'm definitely not looking to do any other mods to the car such as remapping or downpipes etc, so I'm wondering if anyone has heard a standalone MPE on a 335i in person and for their thoughts on it. Online it seems it's a slight improvement over stock but nothing too wild, which probably sounds like what I'm after. Any thoughts appreciated!
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04-20-2022, 01:11 PM | #2 |
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If your current system is valved, the MPE may drone a bit at 60 and 70mph, especially when loaded up motorway hills.
My 440 MPE was awful when the caravan was behind; low revs and pulling hard made motorway cruising uncomfortable....although I did have the front box deleted too! Ordinarily it was fine though. |
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04-20-2022, 01:35 PM | #3 | |
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04-22-2022, 03:49 AM | #4 |
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Think the MPE for the 335i is still valved? if so will be fine. This shows it but you would need to check.
https://www.realoem.com/bmw/enUS/sho...diagId=03_0059 The MPE for the 340/440i is not valved and as said above it drones when trying to cruse or under load when using the torque not the revs of the engine. So much so I sold mine after 2 weeks and just have the standard back box with valve permanently open & MPE tips. But the sound of a B58 is different to the N55 engine. The back box I bought was second hand but excellent condition and the drone was always there. Here you can see the 340/440i one as a comparison.... Last edited by Alscoob; 04-22-2022 at 03:59 AM.. |
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04-22-2022, 08:36 AM | #5 |
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04-22-2022, 12:18 PM | #6 | |
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04-23-2022, 05:27 AM | #7 |
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Yes bought used but I cleaned it up to sell. Stainless steel exhausts should be shiney !!
Not sure on the 335i but on the x40i's you can get a plug for the connector when it's off the exhaust believe it stops it throwing a fault up. around £18 from BMW (18302411427 Dummy flap actuator for the x40i's) But maybe the electronics are different on yours and it's not needed. |
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04-23-2022, 09:08 AM | #8 | |
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I'll give it a go when I get a friend over to get on the revs so the flap will be open when I unplug it - which should mean it then permanently stays in the open position, fingers crossed!
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