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Thread: New Exhaust

  1. #1
    Join Date
    Mar 2008
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    San Luis Obispo, CA
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    1985 M635csi, 97 HD fatboy with stroker motor

    New Exhaust

    Got my new exhaust installed. Unbelievable difference in performance, and sound. I think I picked up the euro headers about two months ago thanks to the timely tip from a member here. (Cheap euro headers on SF CL)

    The old system was really worn out. Orig. cat, two 1.5" pipes and the federal header which was cracked and leaking. Three studs broke off in the head, (2) above port 1 and (1) below port 6.

    Any way here are some pictures of the system from my phone. The fabricator did a beautiful job. Just perfect.

    I picked up a Magnaflow parts cat and "muffler" for about $225 shipped and $500 for fabrication.

    It may be a little loud, but right now it sounds like music. And oh man the difference in power and the smoothness of the pull up through the RPM has put a permanent smile on my face.
    Attached Images Attached Images
    Last edited by Badgas; 02-14-2010 at 08:38 PM.

  2. #2
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    01 M5, 97 M3 track whore
    Awesome! Is the drone inside the car tolerable?
    Got any part numbers on the Magnaflow stuff?
    Last edited by Wrekless; 01-08-2010 at 12:31 PM. Reason: Automerged Doublepost

  3. #3
    Join Date
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    E30
    What are the chances of getting an audio clip?

  4. #4
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    '94 MX-6
    I predict your fuel economy will decrease with this new exhaust, at least in the short run. Call it "the insatiable urge to absolutely cane it" syndrome.

    Looks good!
    -Matt
    Current: '94 MX-6 V6/5 • '72 240Z • '10 Mazda5
    Past: '02 330i/5 • '85 RX-7 GSL-SE • '95 540i/6'95 525i/5'86 635CSi/5 • '88 JZA70 • '86 4K quattro • '85 RX-7 S
    Wish list: Type 44 • Manta • Pre-'85 CGT • 405 Mi16 • SVX • W123 Coupe

  5. #5
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    Quote Originally Posted by msuffern View Post
    I predict your fuel economy will decrease with this new exhaust, at least in the short run. Call it "the insatiable urge to absolutely cane it" syndrome.

    Looks good!
    -Matt

  6. #6
    Join Date
    Oct 2005
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    Boalsburg, PA
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    '83 633csi
    youve built the exact exhaust i want on my car, all the way down the exhaust tip size. The only thing i would do differently, and its because i dont see it on 6ers, is a slash cut on the tips.

    Looks wonderful! You are right, the fabricators did a great job! Looks factory!

    -Jeff
    1983 633csi a.k.a. Wolfie - M30B35 Swap - Getrag 265 - 3.73LSD

  7. #7
    Join Date
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    1985 M635csi, 97 HD fatboy with stroker motor
    Quote Originally Posted by Wrekless View Post
    Awesome! Is the drone inside the car tolerable?
    Got any part numbers on the Magnaflow stuff?
    My first impression was the drone would be to much. My friends don't seem to think so and my wife has not complained so.....I'm giving it some time. I'm to infatuated with it right now to be completely rational.

    PNs
    The cat is; Magnaflow #36008. About $175 from Planet Magnaflow.
    The Muffler is; Magnaflow # 12619. About $75 from Planet Magnaflow.

    I'll try to get an audio or video with audio clip posted this weekend. Another good excuse to drive.

    Quote Originally Posted by msuffern View Post
    I predict your fuel economy will decrease with this new exhaust, at least in the short run. Call it "the insatiable urge to absolutely cane it" syndrome.

    Looks good!
    -Matt
    Thanks Matt. I have no doubt you are right on the money. Ask me if I care though
    Last edited by Badgas; 01-09-2010 at 01:46 AM. Reason: Automerged Doublepost

  8. #8
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    Quote Originally Posted by Badgas View Post
    My first impression was the drone would be to much. My friends don't seem to think so and my wife has not complained so.....I'm giving it some time. I'm to infatuated with it right now to be completely rational.

    PNs
    The cat is; Magnaflow #36008. About $175 from Planet Magnaflow.
    The Muffler is; Magnaflow # 12619. About $75 from Planet Magnaflow.

    I'll try to get an audio or video with audio clip posted this weekend. Another good excuse to drive.


    Thanks Matt. I have no doubt you are right on the money. Ask me if I care though
    Hey, thanks for taking the time to provide the part numbers. I may have to try something similar.
    (I'll post some pictures later to show why I'm looking at options.)

    Here is my motivation for wanting to know more about your exhaust setup.



    Wonder what the effect of these special racing reducers is?




    Runs pretty good considering
    Last edited by Wrekless; 01-09-2010 at 02:30 PM. Reason: Automerged Doublepost

  9. #9
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    Quote Originally Posted by Pino View Post
    What are the chances of getting an audio clip?
    Here is my first try at uploading a link to video.
    I just posted three video clips taken by my buddy this afternoon. I sure hope it works. It was sure fun! I hope you enjoy them.

    [ame]http://www.youtube.com/watch?v=wi6yhJRTmyI[/ame]

  10. #10
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    Bagdad Kentucky USA
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    '86 635
    damn. sounds absolutely great.

  11. #11
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    1985 M635csi, 97 HD fatboy with stroker motor
    Ok, so here are two more videos. A stop-n-go, and a drive by.

    [ame]http://www.youtube.com/watch?v=ZOpxlMWqYHg[/ame]

    [ame]http://www.youtube.com/watch?v=DdCeUiTRhc8[/ame]

  12. #12
    Join Date
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    '86 635Csi '91 911
    Won't let me watch..."Private video."
    '86 635CSi, '91 911 Targa, '11 Ford Flex, '08 H-D Softail.

    If you can read this, thank a teacher. If it's in English, thank a veteran.

  13. #13
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    Quote Originally Posted by braol View Post
    Won't let me watch..."Private video."
    Oops, sorry. Just fixed it.

  14. #14
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    Sounds great!

  15. #15
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    1972 3.0 CSi-1988 M6
    Sounds absolutely fantastic! Reminds me of my ///M when it was installed with the Fahey track pipe and the factory exhaust. Simply spine tingling! Other than an Italian V12 fed by webers, nothing comes close to the engine and exhaust note of a well tuned M88/S38 M5/M6.
    Last edited by M6csi; 01-11-2010 at 09:55 PM.
    Bert
    91 850i-A
    1972 3.5 CSi (L-jet, Getrag 265 5 speed)
    1988 ///M6
    2021 X3 M40i

    The back to back BIG COUPE” duo

  16. #16
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    2001 330ci, 1986 635CSi
    Sounds like a quieter version of my car...

    Except my car isn't an M.
    1986 635CSi - 2001 330ci

  17. #17
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    Quote Originally Posted by Wrekless View Post
    Sounds great!
    Thank you!

    Quote Originally Posted by M6csi View Post
    Sounds absolutely fantastic! Reminds me of my ///M when it was installed with the Fahey track pipe and the factory exhaust. Simply spline tingling! Other than an Italian V12 fed by webers, nothing comes close to the engine and exhaust note of a well tuned M88/S38 M5/M6.
    I agree, there is something about a well tuned 6 cyl that just gets the blood going. Thank you.

    Quote Originally Posted by Zack01GC View Post
    Sounds like a quieter version of my car...

    Except my car isn't an M.
    Hey, any six is a good six.
    Last edited by Badgas; 01-11-2010 at 09:40 PM. Reason: Automerged Doublepost

  18. #18
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    91 325i
    did you take the vids on LOVR? or Tank Farm? =P

  19. #19
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    79 Alpina B7 Turbo, 80 323i Baur, 79 635csi
    Sounds great!
    And maybe it's just the video, but I don't hear any of the low frequency boominess that would typically turn into a drone at times.

  20. #20
    Join Date
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    88 635csi-M
    no joke, that really does sound amazing. Pretty good price on a custom job too!
    88 635sci project car

  21. #21
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    Quote Originally Posted by alrivers View Post
    did you take the vids on LOVR? or Tank Farm? =P
    Darn close. Tank Farm turns into Orcutt Road south of town. That's the road alright.

    Quote Originally Posted by Mike323i View Post
    Sounds great!
    And maybe it's just the video, but I don't hear any of the low frequency boominess that would typically turn into a drone at times.
    Below around 2500 RPM under load it drones in the cabin. I am thinking of adding some sound mating in the trunk and under the rear seats. My theory is that the large areas back there are acting as a passive diaphragm into the cabin. If I get to it and it works, I will report back.

    Quote Originally Posted by rbodor3 View Post
    no joke, that really does sound amazing. Pretty good price on a custom job too!
    Thank you!!! I am still very happy with the system, the sound and the performance. It goes like stink compared to the old system.

    The guy that did the work mainly does custom fabrications now but his dad owned a great muffler shop in town and kind of grew up around the biz. He was hesitant at first, but when I described the job and he looked it over, he got much more interested. I had to get him all the parts, but he picked up on the vision and man can he fabricate and weld. Cash helps keep the cost down to I suppose.
    Last edited by Badgas; 03-13-2010 at 12:51 AM. Reason: Automerged Doublepost

  22. #22
    Join Date
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    Thanks for getting me thinking Badgas. I just finished my new exhaust and I'm happy to report it doesn't have any bubble gum welds or racing reducers now. Thanks to your input, I checked out the stainless offerings from Magnaflow and ordered a 2.5" by 7" satin stainless muffler and oval sliced stainless tip.
    The downpipes go to a 2-into-1 2.5" adapter with the O2 sensor bung, into a Thrush Turbo muffler and on back to the Magnaflow.
    The sound is exactly what I wanted and there is no drone inside at all.

    I'll snap some pics this weekend when it's up in the air for new RTABs (I put the new dogbones on tonight, woohoo).

  23. #23
    Join Date
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    1985 M635csi, 97 HD fatboy with stroker motor
    Quote Originally Posted by Wrekless View Post
    Thanks for getting me thinking Badgas. I just finished my new exhaust and I'm happy to report it doesn't have any bubble gum welds or racing reducers now. Thanks to your input, I checked out the stainless offerings from Magnaflow and ordered a 2.5" by 7" satin stainless muffler and oval sliced stainless tip.
    The downpipes go to a 2-into-1 2.5" adapter with the O2 sensor bung, into a Thrush Turbo muffler and on back to the Magnaflow.
    The sound is exactly what I wanted and there is no drone inside at all.

    I'll snap some pics this weekend when it's up in the air for new RTABs (I put the new dogbones on tonight, woohoo).
    Sounds sweet. I wanna see, I wanna see. Pics & vids, picks & vids!

  24. #24
    Join Date
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    1985 M635csi, 97 HD fatboy with stroker motor
    Time to update this thread now that the final pieces are in place. The thread started with a whole new system being fabricated. As the engine is tuned to run for power, it is to rich for the aftermarket high flow CAT which was consumed in two years. This was when I decided to fabricate some flanges when I installed a replacement CAT. Now I finally got around to having the "track pipe" section fabricated and installed. The additional glass-packs absorbed the low low load-low RPM drone in the cabin as well which is a big plus. Flanges 10.jpgCAT 1.JPGTrack pipe 1.jpg

  25. #25
    Join Date
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    '85 635 CSi Euro 5sp.
    VERY nicely done.
    Dean
    Lutz, FL

    '85 635 CSi Euro #9402254
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