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BMW M135i cabin engine sound is artificially enhanced [videos]

Similar to M5 (F10)

A BMW M135i owner has discovered the cabin engine sound is artificially enhanced, just like in the M5 (F10).

He managed to unplug the sound symposer device and noticed the radio wasn't working anymore. While the car exhaust sounded normal, the low-bass sound of the 6-cylinder engine was gone leaving only a "faint choked turbo six with the dump valve being the loudest thing." He added the differences are more noticeable from 2,500 rpm.

After plugging the device back in, the audio system started working normally and the beefier engine sound was once again available.

Thanks to Declan Lewis for the tip!

Published Jan 7, 2013 1:10 pm By Adrian Padeanu
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Comments (21)

 Flanders.Europe Flanders.Europe
It's indeed because of the stupid fuelsaving regulations in the EU. I live in the Flanders, Europe and in our country we even have a CO2 tax since 2011! It Virtually makes buying anything above a 3 litre petrol or diesel-car, (doesn't matter anyway, although thanks to the artificially held low prices on dieselfuel the past decade,thx socialist governementscum) financial suicide!!! Anyway, i like the M1 and TT-RS better then this lot i tell you that! The Bangle M5 is on my wanted list when I graduate from the Uni. I'm pushing my dad for an R8 daily now, but he's not prepared to pay 2000 euros!!! a year just to get it legally on the road! And some 3000 euros the first time put it into the trafic,when you buy one makes 5000veuro before you CAN even drive it out of the street you live. MAdness, gues i can forget the ZR1 i wanted for my birthday...
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January 15, 2013 7:27 pm
 efgh efgh
it was lame enough when they used this thing in the M5; now they use it and don't even bother telling us? nice...
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January 8, 2013 10:06 pm
 schizo schizo
Turbocharged cars are naturally quieter than NA cars. Back in the days (90's) people were running Supra's and Z's with a straight pipe from the cat back (sometimes even the cat was mysteriously gone and only appeared during emmissions tests) and getting away with it. Good to know the M135i sounds so delicious.
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January 8, 2013 10:08 am
 BeEmWe BeEmWe
How's that bad? You enjoy the engine sound without too much road/outside noise!
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January 8, 2013 1:58 am
 AlikMalix AlikMalix
BMW, Ferrari, Lambo, and Porsche have the best sounding cars ever. Thanks to your liberal governments - they're forced to dampen the roar's and clog the sound pipes. The only way to still enjoy your engine is by artificially bring the sound into your cabin, so you can enjoy it anyway, without hurting the "feelings" of the Toyota driver next to you.
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January 7, 2013 5:23 pm
 TeddyForsythe TeddyForsythe
Fake engine noises or not, this car is still brutal looking, those headlights are ugly as sin.
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January 7, 2013 4:58 pm
 AG4 AG4
They should have just done what Ford did, use a sound tube which channels the engine sound to the dashboard panel/cabin.
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January 7, 2013 2:43 pm
 Microice Microice
i wonder just how much better fuel consumption figures would be if car manufacturers didnt stuff cars with these useless gadgets.
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January 7, 2013 2:36 pm
 dmanero dmanero
No suprise there, seems alot of car manufacturers are going that direction.
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January 7, 2013 2:23 pm
 The Petrolhead The Petrolhead
Still sounds gorgeous !! I love that car. The 5-door version is absolute perfection
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January 7, 2013 1:52 pm
 SnakesInMyPants SnakesInMyPants
shameless
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January 7, 2013 1:51 pm
 CDspeed CDspeed
It still sounded pretty good.
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January 7, 2013 1:41 pm