I want it louder...

Discussion in 'E90 Saloon / E92 Coupe / E93 Convertible M3 (2008-2013)' started by Ashuk, Jun 12, 2019.

  1. 12 Jun 2019 at 12:14 PM #1
    Ashuk

    Ashuk A mere Chipper

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    Hello guys,
    Ive had the back box modded on my E93 M3. Sounds beautiful, however I wish it to be louder.
    I understand I can have the CATS removed?
    HAs anyone just had the secondary CATS removed or do I need to have em all removed?

    I honestly don't know much about exhaust mods, so please don't laugh if my post makes no sense. :)

    Cheers
     
  2. 12 Jun 2019 at 12:45 PM #2
    Mikeb1984

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    I’m in a similar position. I’ve got the m performance exhaust on mine and I feel I want it a little louder but I’ve heard others with the primary cat delete and it’s too loud for me!
     
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  3. 12 Jun 2019 at 2:15 PM #3
    Poon

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    Be careful I swapped my primary cats for Akra and an Akra xpipe and put my 2.5 mod back box back on and it’s way too loud and raspy.

    Going to get it redone to 1.5ish next week.
     
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  4. 12 Jun 2019 at 4:44 PM #4
    Ashuk

    Ashuk A mere Chipper

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    Is it possible to leave primaries as is and just remove the secondary cats?
     
  5. 12 Jun 2019 at 6:22 PM #5
    kevM3

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    ive got a 1.75 box if you wanna swap
     
  6. 12 Jun 2019 at 6:35 PM #6
    jayukRS

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    1.75 so precise :p

    This or the 2 pipe mod is the sweet spot
     
  7. 12 Jun 2019 at 6:45 PM #7
    kevM3

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    Yeah maybe 2.5 is a bit too loud
     
  8. 12 Jun 2019 at 8:03 PM #8
    BobbyMac

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    I'm up for a swap mate if the other guy doesn't want to, and if you still want to. I'm after something a bit quieter for track days. Cheers
     
  9. 12 Jun 2019 at 8:03 PM #9
    Mr Reeves

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    4 pipe with full decat is about right, sound-wise.
     
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  10. 12 Jun 2019 at 8:09 PM #10
    mill

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    I have the 2.5 and it’s a tad on the noisy side on start up but not excessive (literally makes me smile every time though) then quite modest on normal driving with a lovely purr
     
  11. 13 Jun 2019 at 9:32 AM #11
    M3NickM3

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    2 pipe mod from PCW is perfect, maybe slightly loud, so 1.75 might be better. 2 pipe mod is not stupidly loud and fake like a lot of other cars you hear, but its a lot louder than stock! When I compare the 2 E92s, the stock one feels like a 3 series now due to the sound being non existent lol.

    I also feel I do not have to push the car as much in to high rev ranges to get some sound, so it ends up with a more relaxed driving experience.

    Down shifts sound much better now, and even when it automatically downshift you get a nice noise.

    If you do not feel comfortable with people turning heads and looking at where the noise is coming from, do not do it. I used to get a few looks at the vehicle from people passing, now the noise attracts a lot more attention. It feels a bit cringe/asbo sometimes, but its a great car and needed some noise presence to match the look of the car.
     
  12. 13 Jun 2019 at 12:49 PM #12
    conleth m3

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    has anyone had the various exhaust mods noise tested? dont want to make the car too noisy for trackdays, what static dB levels are they making?

    would love an akra backbox - noise police friendly from what i understand. is the MPE similar?
     
  13. 13 Jun 2019 at 2:44 PM #13
    Daddy

    Daddy On the path

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    I got measured at 106db static @ 6000rpm with a 2 pipe mod at Brands Hatch. The limit is 105db. They let me on but warned me I would likely get flagged for the drive by. As it turned out I didn't but that might be down to the fact that I was on a novice day so wasn't giving it 100%.

    I was a bit surprised as others had said the 2 pipe was OK. Perhaps it wasn't measured right, I over-revved or it's just louder than average. I would have liked to try Bedford but there's no way I'd pass there without going back to stock.
     
  14. 13 Jun 2019 at 3:28 PM #14
    Twiglet

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    Running 4pipe and primary decat, loud but not in a raspy rough and annoying kind of way. In my opinion it sounds how it was meant to before all the emissions bits were forced on there. The extra +35bhp is nice too.
     
  15. 13 Jun 2019 at 7:21 PM #15
    conleth m3

    conleth m3 On the path

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    Cheers, Good to know, that’s pretty loud then! Might have to go less than 2 if modding std exhaust
     
  16. 13 Jun 2019 at 7:23 PM #16
    conleth m3

    conleth m3 On the path

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    Must sound epic! And 35 bhp is always useful :)
     
  17. 13 Jun 2019 at 7:43 PM #17
    mill

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    Wowsers i didn't think mine was that loud, i had to have the exige exhaust repacked for trackdays as that was reading 106db and i must say the 2.5 mod i have is much quieter, Although i'm only going off what the previous owner said so it might well be different
     
  18. 13 Jun 2019 at 7:45 PM #18
    M3NickM3

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    2 pipe is loud, I personally wouldn't want it any louder. I do feel at times it maybe to loud.
     
  19. 11 Oct 2019 at 4:52 PM #19
    HB1

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    I dont suppose anyone can help me out with a dB reading for an MPE with primary cat delete? Is that a non-starter for trackdays?
    (I currently have a 2 pipe that passes at Bedford with a reading of ~92dB at 5,500 revs. and am considering moving to an E90 which already has the MPE with primary delete.)

    Thanks!
     
  20. 11 Oct 2019 at 5:05 PM #20
    boba fett

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    Firstly what mod did you have done ?

    Can't think you would want anything more than say a 2.5 as thats loud enough really and sounds like a full fat Nascar !!

    I've heard a 4 pipe mode, and I like noise, but to loud !!
     

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