[E46] Supersprint resonated section 2 / centre section

Discussion in 'Engine maintenance, upgrades and modifications' started by YoungBenny, Jul 20, 2019.

  1. 20 Jul 2019 at 2:54 PM #1
    YoungBenny

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    Today I fitted my resonated Supersprint centre section to my otherwise stock exhaust, and this is a selection of my findings.


    WEIGHT:

    Between myself and @Nunga we figured out that the weight saving over OEM is around 2.5kgs. Roughly 9.5kg down to 7kg.


    NOISE:

    At idle, it is the same. Revving in neutral sounds slightly different. There is slightly more bass and the noise is more of a bark.

    While driving, again it sounds pretty similar. Didn't get a chance to fully open it up on the way home but the rasp is reduced a little and the volume is not noticeably different.

    On the whole it is not a particularly large difference, while it may have been just me, I couldn't help feeling like the system sounded a bit strangled, I am hoping that fitting the race back box (which is on the list for the future) will open up the exhaust and exaggerate the characteristics of the centre section.


    FITMENT:

    The fitment to the cats is simply 2x 3 nuts & bolts. Mine needed air chiseling out. I considered lowering the whole system from the front of the cats to the back box and cutting them out but the chiseling seemed to work pretty well in situ. I ordered new nuts and bolts from BMW.

    Once the clamps to the back box were undone, the centre section can be twisted to break the seal with the back box sleeved pipe and then angled down and slid out easily.

    However, upon re-installation, even after wire brushing and with 2 people it was proving difficult to get the sleeve back in, and given I still had yet to fit the X8R clamps I decided to remove the back box and mate the two together on the floor, using a fair bit of wiggling, the provided aftermarket seals, exhaust paste and some gentle encouragement from a rubber mallet.

    As you can see in picture 2, my second hand centre section came with two flanges and the wire seal already attached. These flanges presumably mate up to the SS back boxes perfectly, but as one of them cannot be removed due to the flare on the pipe, you would not be able to fit these to an OEM backbox without the X8R clamp. Or if you did you would have a flange rattling around. The 2 peice X8R clamps are exactly the same size as the Supersprint flanges, so instead of needing all eight, I only needed four, and the bolts ran through both and held them together.

    Unfortunately I didn't know I was going to write this so didn't get any pictures of this but the bolt set up is supposed to go "BOLT->WASHER->flange->flange->WASHER->SPRING WASHER->NUT". But the lack of taper on the Supersprint flanges means that you won't get the nut on with the washers. To remedy this I did up the nuts to tighten the clamps and then took them off and replaced after fitting the washers. When tightening the sleeved section, my old wire seal cracked, so I decided to start again with the provided new one.

    The bolts were done up just enough to allow a bit of flex, then it was all bolted back up at the back, then the central mounting bracket and cat bolts, before finally tightening the back box bolts once I was sure it was all aligned.


    [​IMG]

    [​IMG]

    [​IMG]


    I hope this will be of some use to people thinking of going down this route, if you would like to see more of my car, the build thread is here...

    https://forums.m3cutters.co.uk/threads/young-bens-silbergrau-e46-m3.212111/page-2#post-2806069

    And if for some reason you have arrived here and need an OEM centre section, mine is currently for sale here...

    https://forums.m3cutters.co.uk/threads/e46-m3-oem-centre-section-with-gaskets-£60.215158/

    Cheers.
     
    Last edited: Jul 21, 2019
  2. 20 Jul 2019 at 3:56 PM #2
    Nunga

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    I had to drop the exhaust from the cats as well, such was the condition of the bolts joining the cats to the centre section. Are you happy overall with it though? I guess it’s not a negative change worst case.
     
  3. 20 Jul 2019 at 4:29 PM #3
    YoungBenny

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    Yes I'd say so. The volume is the same and the note only a little different. I guess you could say it sounds a tiny bit more "civilised".
     
  4. 8 Sep 2019 at 9:00 AM #4
    monkeyboy

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    So the supersprint res section quietened down the std exhaust sound?
     
  5. 8 Sep 2019 at 11:12 AM #5
    YoungBenny

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    It's not exactly "quieter" just different. I only noticed the difference just after I'd fitted it, I can't really remember it sounding much different before, especially from the inside.

    I'd imagine it's quieter than the non-res section, but if you want to quieten down an otherwise standard system I wouldn't bother
     
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  6. 8 Sep 2019 at 7:52 PM #6
    monkeyboy

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    Just have a fear of putting a resonated supersprint section on and it actually being quieter than the oe centre section
     
  7. 13 Sep 2019 at 8:16 PM #7
    M3POWERBOY

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    I found virtually no sound difference when I fitted my non res Supersprint x-pipe to my Eisenmann Race back box
    Maybe a tiny bit louder when booting it but I thought taking out a silencer would make a big noticeable difference??!!

    I was a little disappointed tbh!
     
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  8. 13 Sep 2019 at 10:01 PM #8
    YoungBenny

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    If I'm honest, me too. I am not sure how much of the (small) sound difference is down to placebo. But it's nice and shiny, so that's something
     
  9. 14 Sep 2019 at 12:19 AM #9
    R60BBA

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    What about drone?
     
  10. 14 Sep 2019 at 6:28 AM #10
    M3POWERBOY

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    Not really much difference

    It drones slightly with just the Eisenmann Race fitted but not to bad
     
  11. 14 Sep 2019 at 8:02 AM #11
    monkeyboy

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    I’ve waste so much time trying to decide on which one to buy between res & non res lol! Guess it’s more weight saving than performance then with the sections if they don’t change the volume too much! That’s good for me as I love the exhaust sound with the Eisenmann and don’t want it any louder. Although I wasn’t 109 cell cats which I’m told will increase the sound, so may do them 1st
     
  12. 16 Sep 2019 at 9:26 AM #12
    DaveMSport

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    I've Supersprint manifolds, cats, non-res center section and lightweight race rear section.

    Was thinking of getting a resonated center section to maybe make it a little bit quieter and trackday friendly but not sure if it'll be worth it going by these findings
     
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  13. 17 Sep 2019 at 10:37 AM #13
    M3Loon

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    I have all what you have
    i have all the same equipment as yourself and I have never had any problems at any tracks I’ve visited, 96db is what it makes , I’d stick with what you’ve got
     
  14. 17 Sep 2019 at 11:28 AM #14
    Mike RT4

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    I only have the full Supersprint system from the standard CSL headers back (200 cell SS cats, non-resonated centre and LWR back box) and on the static noise test mine is 104dB (hot) and 106dB (cold) :eek: ! I was hoping that the new resonated twin system will make it a bit deeper (I hate rasp) and quieter (as per the reports from the US M3Forum), so that will be my next purchase.

    A mate has the same set-up as above on his car, but with the single pipe resonated center section and his is significantly quieter, so the resonated part must do "something".
     
  15. 17 Sep 2019 at 12:01 PM #15
    YoungBenny

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    That's slightly reassuring to hear
     
  16. 17 Sep 2019 at 12:21 PM #16
    monkeyboy

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    Any vids of your set ups guys?
     
  17. 17 Sep 2019 at 1:58 PM #17
    Mike RT4

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  18. 18 Sep 2019 at 7:16 AM #18
    monkeyboy

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