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  1. #1
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    Muffler Delete w/DP's and DP Stud removal.

    Anybody have any idea how an E90 with muffler delete and DP's sounds? I plan to build my own exhaust in the future, and this was going to be a starting point until I choose exactly what muffler(s) I want to use. I've heard some youtube videos of E92's, but they have one less resonator. Just wondering how this would turn out. DP's plus stock exhaust sounded no different than stock to me. Just louder cold start. I can't imagine it being that bad after driving with open DP's for 2 weeks either lol.

    Also, anybody have any trick to get the studs our of the stock DP flange. I've tried everything I can think of. I used a torch, vice gripes, hammer, and even did a hulk smash at the end of my driveway. They won't come out. I'm about to cut them off and drill them out, but don't really feel like going through all that.

  2. #2
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    Frankie has this setup, it sounds like a screaming banshee at WOT.
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    Click here to enlarge

  3. #3
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    If you mean that in a good way, I'm going to try and do it tonight lol

  4. #4
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    It will be too loud I think but hey, your car and your ears.

  5. #5
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    I can't see it being that bad. I will still have the secondary cats and the lima bean resonator. With open DP's I thought my ears were gonna bleed.

  6. #6
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    get ready for absurd drone at highway speeds...

  7. #7
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    Not going to be able to do it tonight. We have some nasty thunder storms, and my buddy doesn't want to bring his welding stuff over. I'm bored as hell, so I think I'm going to remove the thermostat from my oil cooler and remove some of the ducting blocking airflow to the core.

    Still need help getting those studs out if anybody has any ideas.

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    Click here to enlarge Originally Posted by BoostAddict Click here to enlarge
    Not going to be able to do it tonight. We have some nasty thunder storms, and my buddy doesn't want to bring his welding stuff over. I'm bored as hell, so I think I'm going to remove the thermostat from my oil cooler and remove some of the ducting blocking airflow to the core.

    Still need help getting those studs out if anybody has any ideas.
    If you intend to do it please take some pics so we can see.

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    Removed the Thermostat. Took all of about 10 minutes. I don't if it helped as I didn't driver around yet, but will report results tomorrow. Also going to try to do the muffler delete tomorrow, depending on how lazy I feel and how much HW I get done.

    Pic of Thermostat:
    Click here to enlarge

  10. #10
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    Why did you remove the the thermostat?

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    Click here to enlarge Originally Posted by FR305 Click here to enlarge
    Why did you remove the the thermostat?
    The thermostat doesn't fully open until oil temps reach 235* meaning the oil cooler isn't being used. I live in a pretty warm climate so I wanted to see if it would run any cooler without it, or at least stay cool longer. The main issue is the core itself is way to small, but if I can get a consistent 10-15* drop in temps I'll very happy considering how easy this was.

    This probably should have its own thread.

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    yea ive also never heard of removing the thermostat. Let us know how it works out for you

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    Well, it was a hot day, 93* and 70% humidity and oil temps were reduced. They stayed around 210ish while cruising around (down 25*) and on the highway about 240* (down about 10*). Also noticed the car cooled off way quicker. Bottom line is the stock core is too small for the amount of oil this engine holds, but we all new that already.

    Muffler delete was completed today. Sounds great. Drone wasn't bad. It was definitely worth it. I'll try to take some pictures tomorrow if I have time. I learned some interesting things about mild steel and heat expansion. Needless to say I probably will redo this using stainless instead Mild Steel. All in all, good mod and only costed me $30 ($23 for 6ft of 2.5in Mild Steel and $7 for a stainless rod from home depot to make hangers).

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    Click here to enlarge Originally Posted by BoostAddict Click here to enlarge
    Muffler delete was completed today. Sounds great. Drone wasn't bad. It was definitely worth it. I'll try to take some pictures tomorrow if I have time. I learned some interesting things about mild steel and heat expansion. Needless to say I probably will redo this using stainless instead Mild Steel. All in all, good mod and only costed me $30 ($23 for 6ft of 2.5in Mild Steel and $7 for a stainless rod from home depot to make hangers).
    Glad to hear you like it and that the drone is not too bad.

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    1 out of 1 members liked this post. Yes Reputation No
    Okay, here's a few pictures of the muffler delete. Keep in mind this isn't final and we still have a few adjustments to make. I ended up using the tips from my stock 350Z muffler I had sitting in the garage. A local guy did it first and it looked right, so I figured what the hell

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

  16. #16
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    That's pretty clever using the nissan tips, they do look good.

    You might want to reconsider putting the thermostat back in, it's supposed to let the oil heat up as fast as possible while the engine is cold. Cold oil during warmup is bad so the thermostat stays closed and only opens when the oil reaches operating temperature.
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    Click here to enlarge

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    1 out of 1 members liked this post. Yes Reputation No
    I think you should coat it in matte black. Here is mine for comparison.


    Click here to enlarge

  18. #18
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    That's pretty clever using the nissan tips, they do look good.

    You might want to reconsider putting the thermostat back in, it's supposed to let the oil heat up as fast as possible while the engine is cold. Cold oil during warmup is bad so the thermostat stays closed and only opens when the oil reaches operating temperature.
    I'm not really concerned. I live in south Florida and it's hot as well. If I lived up north I would probably leave it in.

    Click here to enlarge Originally Posted by FR305 Click here to enlarge
    I think you should coat it in matte black. Here is mine for comparison.


    Click here to enlarge
    That's on the agenda. Just have to make some adjustments first. It does look much cleaner.

  19. #19
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    Click here to enlarge Originally Posted by BoostAddict Click here to enlarge
    Okay, here's a few pictures of the muffler delete. Keep in mind this isn't final and we still have a few adjustments to make. I ended up using the tips from my stock 350Z muffler I had sitting in the garage. A local guy did it first and it looked right, so I figured what the hell

    http://www.bimmerboost.com/images/im...11/09/31-1.jpg

    http://www.bimmerboost.com/images/im...11/09/41-1.jpg

    http://www.bimmerboost.com/images/im...11/09/24-1.jpg
    I'm surprised the tips don't even look bad.

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