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Thread: 3" Exhaust that doesnt suck

  1. #1
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    3" Exhaust that doesnt suck

    After running around with the RMS headers last night and suggestions from my fabricator and posts on here, its become apparent that the Active track pipe (Says 3", drops down to 2" in the muffler) and Eisemann rear section are now holding up the exhaust flow. I want to move to a 3" but I still want to be able to take this car on long trips without dealing with drone. I looked at the Bimmerworld 3" setup but I've seen a lot of folks state that its just loud and drones like hell. Anyone have a custom setup that they daily that does well?

    Or do I hack up my Active and put in a higher flowing muffler?
    1995 M3...Screwed

  2. #2
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  3. #3
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    D3 A8 4.2 - E36 Turbo
    Drone generally comes from a lack of mid section muffling (resonator). Overall loudness generally comes from rear muffler selection.

    More restriction generally means quieter.

    E36 DYNO TUNING WIRING PARTS

  4. #4
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    I used to havea 3" with a vibrant ultra quiet res in the middle and a Borla xr1 in the rear and it didn't drone.
    H&R Coilovers - Powerflex LCAB/RTAB - Apex Arc8 Powder Coated Gold(17x9) - S52 Swap - Built Head- Built Bottom End- Borg Warner S256sx- Boost Logic- Tial 50mm/44mm - TRM 60# Tune- Full 3" Exhaust w/Vibrant & Borla - Auto>Manual Swap - ZHP Shift Knob 463whp/411wtq at 13.8Psi

  5. #5
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    I have a 3" exhaust for sale right now. I will see if I can get the PO to provide some sound clips as I never installed it. Would be willing to work out some sort of trade for the AA "b" section as I need that anyway.

    https://www.bimmerforums.com/forum/s...naflow-Muffler

  6. #6
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    Quote Originally Posted by Alpine 318is View Post
    I have a 3" exhaust for sale right now. I will see if I can get the PO to provide some sound clips as I never installed it. Would be willing to work out some sort of trade for the AA "b" section as I need that anyway.

    https://www.bimmerforums.com/forum/s...naflow-Muffler
    Let me think about it...to be honest, you might install that, you'll get a decent bump in power

    - - - Updated - - -

    Quote Originally Posted by rajicase View Post
    I used to havea 3" with a vibrant ultra quiet res in the middle and a Borla xr1 in the rear and it didn't drone.
    Just listened to some XR1 clips, like the sound. What are you running now?
    1995 M3...Screwed

  7. #7
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    1995 BMW M3
    I am running a magnaflow center muffler and a borla xr1 rear muffler; 3.5"
    H&R Coilovers - Powerflex LCAB/RTAB - Apex Arc8 Powder Coated Gold(17x9) - S52 Swap - Built Head- Built Bottom End- Borg Warner S256sx- Boost Logic- Tial 50mm/44mm - TRM 60# Tune- Full 3" Exhaust w/Vibrant & Borla - Auto>Manual Swap - ZHP Shift Knob 463whp/411wtq at 13.8Psi

  8. #8
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    You should update your sig
    1995 M3...Screwed

  9. #9
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    Quote Originally Posted by Jab31169 View Post
    You should update your sig
    I have built about 5 exhausts. Na and turbo. Always use a resonator and a big muffler and it will be nice once it breaks in.

    I prefer the big oval muffler sound.

    Vibrant gear is nice. We shoulda built you one while i was local.


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  10. #10
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    Read this, I spent a lot of time and money testing.

    http://www.bimmerforums.com/forum/sh...aust-Q-amp-A-s
    '97 M3, Estoril blue, 2 dr, euro 6-spd, EFR 9180 divided T4 .92 IWG, RK tuning, CP 8.5:1 pistons, Eagle rods, Schrick cams, L19 11 mm ARP studs, O-ringed block, Supertech stainless/inconel valves, Supertech springs & Ti retainers, ported head, S54 oil pump/pan, 80 lb. injectors, OBD1 intake manifold, Steedspeed twin scroll T4, 3.5" SS exhaust, eBoost2 EBC, HFS-4 W/M injection, AEM Failsafe, Zeitronix data logger, Racelogic TC, OpenOBC w. ethanol %, Ireland Eng. engine mounts, UUC black tranny mounts w. enforcers, UUC twin disc feramic, ARC-8's, MCS 2-ways, Z3 rack, Rallyroad strut bar, X brace, Eibach sway bars, Ground Control LCAB bushings, Bimmerworld RTAB's, Powerflex subframe bushings, 210 4-clutch LSD, Stoptech BBK, titainium shims, steel braided lines, brake cooling ducts.

  11. #11
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    98 Turbo M3, 04 E53 X5
    Im using 2 - Vibrant 3.5" mufflers with open 38mm gates. FF to 30secs


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  12. #12
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    The OP is supercharged, a straight though 3.5" would make him deaf.
    '97 M3, Estoril blue, 2 dr, euro 6-spd, EFR 9180 divided T4 .92 IWG, RK tuning, CP 8.5:1 pistons, Eagle rods, Schrick cams, L19 11 mm ARP studs, O-ringed block, Supertech stainless/inconel valves, Supertech springs & Ti retainers, ported head, S54 oil pump/pan, 80 lb. injectors, OBD1 intake manifold, Steedspeed twin scroll T4, 3.5" SS exhaust, eBoost2 EBC, HFS-4 W/M injection, AEM Failsafe, Zeitronix data logger, Racelogic TC, OpenOBC w. ethanol %, Ireland Eng. engine mounts, UUC black tranny mounts w. enforcers, UUC twin disc feramic, ARC-8's, MCS 2-ways, Z3 rack, Rallyroad strut bar, X brace, Eibach sway bars, Ground Control LCAB bushings, Bimmerworld RTAB's, Powerflex subframe bushings, 210 4-clutch LSD, Stoptech BBK, titainium shims, steel braided lines, brake cooling ducts.

  13. #13
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    Maybe, but I highly doubt it. I love the look and sound of my Dinan cat back, plus I want to be as plug and play as possible with no fab work. AA headers and AA B section do that for me

    Quote Originally Posted by Jab31169 View Post
    Let me think about it...to be honest, you might install that, you'll get a decent bump in power

  14. #14
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    #Project333Ti & Z3 Coupe
    3" is going to be loud unless you run 2 large mufflers. I've done it multiple times with various combos on NA applications. Vibrants are loud mufflers and so is the Borla XR-1. This was 2.5" single exhaust with ebay headers, a Borla Pro-XS mid muffler and a Vibrant street power out back. No drone, and mild below 3500 rpms, definitely loud at WOT. If you ran this combo with 3" it would definitely be louder.

    https://www.youtube.com/watch?v=nS2RJCk_itY
    https://www.youtube.com/watch?v=r2H5YreLZqk

    On my s52 Ti, I run Racleand headers, to single 3" with a Vibrant Ultra Quiet resonator AND a Vibrant 12" resolator after that, to a Borla Pro-XS rear muffler. It's about as loud as my 2.5" exhaust was on my e30 with a deeper sound because of the headers and Borla out back.
    Last edited by e30polak; 02-17-2017 at 03:10 PM.

  15. #15
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    This the semi-current sound out of mine, its a little deeper now with the RMS headers

    https://youtu.be/L7-GFGTWYTg?t=1891
    1995 M3...Screwed

  16. #16
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    99 M3
    I'm still NA (for now), but my exhaust is similar: SS rep long tube headers into Y-pipe into 3" piping.
    I'm using a 3" Mangaflow race cat and two 3" Magnaflow oval-body straight-through race mufflers.
    No drone and nice tone (Magnaflow sometimes sounds like poo).

    I used to not have the center muffler for better ground clearance, but I added the center muffler (only 3.5" case height for better ground clearance), and the car got much quieter (esp when not full throttle) and much less raspy.
    If my car was currently running, you could come hear for yourself in person...
    Last edited by m3leistung; 02-17-2017 at 07:31 PM.
    99 M3

  17. #17
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    08 E90M3; 99 E36M3 Turbo
    Turbo chews up the noise. Supercharger is much louder. I went with RMS to modified euro SS mid to euro SS rear. If single 3.0, you will want at least 2, maybe 3 resonators/mufflers.

  18. #18
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    The AA track pipe offers to high of back pressure based on the back pressure measurements that I took on my superchargers s52 at 13 psi. It looks pretty and fits nice though.
    '97 M3, Estoril blue, 2 dr, euro 6-spd, EFR 9180 divided T4 .92 IWG, RK tuning, CP 8.5:1 pistons, Eagle rods, Schrick cams, L19 11 mm ARP studs, O-ringed block, Supertech stainless/inconel valves, Supertech springs & Ti retainers, ported head, S54 oil pump/pan, 80 lb. injectors, OBD1 intake manifold, Steedspeed twin scroll T4, 3.5" SS exhaust, eBoost2 EBC, HFS-4 W/M injection, AEM Failsafe, Zeitronix data logger, Racelogic TC, OpenOBC w. ethanol %, Ireland Eng. engine mounts, UUC black tranny mounts w. enforcers, UUC twin disc feramic, ARC-8's, MCS 2-ways, Z3 rack, Rallyroad strut bar, X brace, Eibach sway bars, Ground Control LCAB bushings, Bimmerworld RTAB's, Powerflex subframe bushings, 210 4-clutch LSD, Stoptech BBK, titainium shims, steel braided lines, brake cooling ducts.

  19. #19
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    1995 s52 M3
    3.5" tubing with a spintech muffler. Slip fit connection at headers





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    Last edited by reno5658; 02-17-2017 at 11:57 PM.



  20. #20
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    Following this closely. Want to go to a 3" header back exhaust for my setup as well. I want to retain my Remus muffler but I'll have to split back into dual before the muffler if I really want to keep it. So Ill be Longtube headers to 3" midsection straight back to the Remus muffler, pretty much identical to my setup now except I have a dual 2.25" setup that feels restrictive. Hardest part is finding an exhaust shop in the Metro-Atlanta area that will touch an exhaust without a catalytic converter.
    Last edited by maharaj1; 02-17-2017 at 11:03 PM.

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  21. #21
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    Mine's 3" all the way, no cat, Vibrant ultra quiet resonator in the middle, oval muffler out back and it doesn't drone. I believe it was made by Maximum PSI, and used to be attached to NY98M3's car.
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  22. #22
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    98 540 6, SC'ed, 16psi
    Supercharged car here with headers, race cats, and 3". My car was loud. I tried various mufflers. All loud. I finally got it quieter by squeezing in a large Magnaflow 12589 in the back. Straight through muffler, but the large case really knocks down the sound level. Size of the case is the key to reduce sound.
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  23. #23
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    Building a custom 3", will post pics when it's done. Probably won't be done until after the trackids day at barbers the weekend of the 24th

  24. #24
    Join Date
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    I ditched my 3" exhaust on my sc car with RMS headers after a few months. Had a vibrant resonator and muffler and still was unbearable. The euro supersprint stuff is much more tame and still flows great if you're looking for other options.

  25. #25
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    Quote Originally Posted by Jab31169 View Post
    Building a custom 3", will post pics when it's done. Probably won't be done until after the trackids day at barbers the weekend of the 24th
    Use as shallow of bends as possible. I use 14 gauge 45* elbows on my stuff. Seems to keep more noise out of the floorboard. Most people mess up and put a 16gauge 90* right under the seats and have a wicked drone.


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 Tiag/Dove M3 - sold
    1998 Turbo Arctic/black - current
    2001 Lightning - current

    PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Fx725 twin ceramic, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, 14mm diff bolt conversion, Poly engine mounts, UUC trans W/ enforcers, Custom Ms41 id1700 E85 tune..... BUILD THREAD

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