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  1. #26
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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    Stock pipes are 60mm OD, or 2.36 inches. I just measured them. I wouldn't wast time or money going to dual 2.5 OD pipes.
    Wow, I was always under the impression that the stock exhaust piping was 57mm err, 2.25 inches in diameter....this sheds a new light on wanting to get an aftermarket exhaust for me lol....I might just cut out the secondary cats, get some vibrant 1792 resonators welded in, and cut out the x pipe to divorce the piping before the mufflers (effectively eliminating the pancaked section under the passenger side rear axle as well)
    2008 e92 335i: JB4 G5 ISO/BMS back end flash, fbo, e85, inlets, Rb turbos, level 10 valve body + converter, water/methanol.....and a lot more....

  2. #27
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    Click here to enlarge Originally Posted by bobS Click here to enlarge
    A while back I sold my vanguard exhaust and went back to stock. I looooove the stock exhaust bc the booming wound of the vanguard became a nuisance.

    Now I have VTT stg2 turbos on order and I plan on running 93+meth. Will I still be able to run the stock exhaust? I'm sure it will rob some hp/tq but will the increased back pressure be a issue?

    Is there anything I can modify on the stock exhaust to keep the subtle sound but free up the flow a bit? FYI, I have a 335 coupe.
    Stock exhaust will hold you back. If the 'booming' sound is what you are concerned of aren't there valved solutions?
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  3. #28
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    Just as an update i measured a cut e92 335i midpipe yesterday, and came to find out they are 2.36 inch diameter!
    2008 e92 335i: JB4 G5 ISO/BMS back end flash, fbo, e85, inlets, Rb turbos, level 10 valve body + converter, water/methanol.....and a lot more....

  4. #29
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Stock exhaust will hold you back. If the 'booming' sound is what you are concerned of aren't there valved solutions?
    There are but I don't think it's worth it....everyone I talk to seems to say I'll lose maybe 10hp by staying with the stock exhaust, that's no big deal
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  5. #30
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    Click here to enlarge Originally Posted by Stucks Click here to enlarge
    Just as an update i measured a cut e92 335i midpipe yesterday, and came to find out they are 2.36 inch diameter!
    Nice! Thanks for the confirmation
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  6. #31
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    Stock Exhaust is fine until you go to a Single Turbo or Vargas Stage 3s... Even then you just need to "modify" your midpipes & you'd be fine
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  7. #32
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by benzy89 Click here to enlarge
    Stock Exhaust is fine until you go to a Single Turbo or Vargas Stage 3s... Even then you just need to "modify" your midpipes & you'd be fine
    Yep with my ST the secondary cats modified themselves.

    Click here to enlarge
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  8. #33
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    Click here to enlarge Originally Posted by TCW Click here to enlarge
    Yep with my ST the secondary cats modified themselves.

    http://www.bimmerboost.com/images/im...1.jpg~original
    That's definitely hot, lol
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    1 out of 1 members liked this post. Yes Reputation No
    Go with n55 midpipe which is cattless+DPs and I think it will be no problem with the stock exhaust.

  10. #35
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    Click here to enlarge Originally Posted by jackkk Click here to enlarge
    Go with n55 midpipe which is cattless+DPs and I think it will be no problem with the stock exhaust.
    Do you have this setup? Any pics or further explanation as to why I would do this?
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  11. #36
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    Click here to enlarge Originally Posted by bobS Click here to enlarge
    Do you have this setup? Any pics or further explanation as to why I would do this?
    Nope, I got the custome Dps and midpipe and SS muffler.
    The n55 has no cats,only a resonator, while the n54 one has 2 catts and 1 resonator.

    Click here to enlarge

  12. #37
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    Interesting, and I assume it just bolts into place with minimal issues?
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    Click here to enlarge Originally Posted by Stucks Click here to enlarge
    Wow, I was always under the impression that the stock exhaust piping was 57mm err, 2.25 inches in diameter....this sheds a new light on wanting to get an aftermarket exhaust for me lol....I might just cut out the secondary cats, get some vibrant 1792 resonators welded in, and cut out the x pipe to divorce the piping before the mufflers (effectively eliminating the pancaked section under the passenger side rear axle as well)
    taht exhaust would flow every bit as much as your average "catback" exahust that sells for $1500+

  14. #39
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    Click here to enlarge Originally Posted by jackkk Click here to enlarge
    Nope, I got the custome Dps and midpipe and SS muffler.
    The n55 has no cats,only a resonator, while the n54 one has 2 catts and 1 resonator.

    Click here to enlarge

    i think those are 135i midpipes; not sure if the 335i n55 has the same setup....

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by bobS Click here to enlarge
    Interesting, and I assume it just bolts into place with minimal issues?
    i would be warry of doing that, because the e90 and e92 exhaust doesn't have flanges like the 135i does. it's probably easier and more reliable to just cut out the secondary cats and weld in an x-pipe or 2 straight sections.

    135i's can easily switch midpipes. 335i's......not quite bolt-up

  16. #41
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    Click here to enlarge Originally Posted by Stucks Click here to enlarge
    ....I might just cut out the secondary cats, get some vibrant 1792 resonators welded in, and cut out the x pipe to divorce the piping before the mufflers (effectively eliminating the pancaked section under the passenger side rear axle as well)
    You just gave me a great idea and saved me quite a bit of money. Thank you! I think this is the route I'll likely take.

  17. #42
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    Click here to enlarge Originally Posted by Jaxon Click here to enlarge
    You just gave me a great idea and saved me quite a bit of money. Thank you! I think this is the route I'll likely take.
    haha you are welcome! make sure you post up a review on it and take plenty of pictures! Im too scared to hack up my stock exhaust and be the guinea pig for this experiment! most likely just going to buy one of the quieter aftermarket systems (vrsf, ets, ae, ect), and if I don't like it, ill go back to the stock exhaust!
    2008 e92 335i: JB4 G5 ISO/BMS back end flash, fbo, e85, inlets, Rb turbos, level 10 valve body + converter, water/methanol.....and a lot more....

  18. #43
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    I've heard that the VRSF is rather obnoxious.

    I'm going to talk to my shop friend to see what he thinks of cutting things up.
    2010 E90 335i xDrive
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  19. #44
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    Click here to enlarge Originally Posted by Jaxon Click here to enlarge
    I've heard that the VRSF is rather obnoxious.
    Not at all.




    The hpf exhaust is similar, but is very loud and drones a lot due to no muffler.
    2008 e92 335i: JB4 G5 ISO/BMS back end flash, fbo, e85, inlets, Rb turbos, level 10 valve body + converter, water/methanol.....and a lot more....

  20. #45
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    Well I stand corrected. Guess I can't keep all them all straight.
    2010 E90 335i xDrive
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  21. #46
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    Just as an update, I went back to my stock exhaust after running the ets system for about 6 months and I can agree with most everyone else in here, I am enjoying the quietness for now. I can feel less power in the seat dyno department, but its a trade off you have to make if you want a quiet stock-like exhaust.
    2008 e92 335i: JB4 G5 ISO/BMS back end flash, fbo, e85, inlets, Rb turbos, level 10 valve body + converter, water/methanol.....and a lot more....

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