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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Custom Catless Manifold + BMS Downpip Fix Install



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      12-07-2012, 10:05 AM   #67
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That's great news. Makes me want to have more of them made up.

Thank you.
I also recall digging around realOEM and in Euro 130i and Euro e90 330i share the manifolds. Try to confirm though, it was a few months back.
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      12-15-2012, 02:42 AM   #68
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lol hows your MPG lol
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      12-16-2012, 12:56 AM   #69
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lol hows your MPG lol
It improved greatly. I have been off work for the last 2 weeks and it has been a lot of city driving but it is still better than my hwy/city mix pre-headers. It can get ridiculously good on the highway.

Proper tires
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I would imagine would be pretty good mpg.
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      12-23-2012, 01:03 PM   #70
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wow, very tempted to do something similar. Are you beginning to manufacture these lol let me know!
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      12-26-2012, 12:46 AM   #71
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Hi All,

I am having this model built with a single piece mandrel bend piece of pipe in the bends. I should have the first sample within a week or so. If it looks good, I can make as many as I like.
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      01-07-2013, 09:57 PM   #72
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subscribed anxious for updates. This looks good especially since I dont want my car obnoxiously loud
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      01-09-2013, 11:47 PM   #73
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The bends were being done and a problem arose with the machine. Slight delay but I hope to have some good news by week's end.
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      01-22-2013, 02:56 AM   #74
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The bends were being done and a problem arose with the machine. Slight delay but I hope to have some good news by week's end.
Any news?
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      01-23-2013, 06:17 PM   #75
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      01-24-2013, 01:16 AM   #76
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Yes. Currently, I wasn't pleased with some things so I asked for another sample. I will ask for another update and see what it looks like. Will try to post some pics.
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      03-13-2013, 11:21 PM   #77
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soooo....the custom manifold prototype is done. Notice no welds and all bends in the cat delete section. I have been running mine for months without any issues. I don't want to re-install a new set. Anyone want to test these out let me know. It would be best if you are local.
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      03-13-2013, 11:27 PM   #78
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If you were closer or even in the same country I'd consider taking my car to the dyno stock, mmw and your manifolds to test. They look great and there should be decent HP gains from removing the cats for sure.
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      03-13-2013, 11:54 PM   #79
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soooo....the custom manifold prototype is done. Notice no welds and all bends in the cat delete section. I have been running mine for months without any issues. I don't want to re-install a new set. Anyone want to test these out let me know. It would be best if you are local.
How much? If ever.
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      03-14-2013, 12:07 AM   #80
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If you were closer or even in the same country I'd consider taking my car to the dyno stock, mmw and your manifolds to test. They look great and there should be decent HP gains from removing the cats for sure.
Thanks for the offer. my dyno tests showed 10whp gain and about 15wtq on a dynocom. How were your headers after dyno? I now have a secondary cat delete too. The smell of exhaust with the windows down is intolerable. Same thing for you? I will dyno again to see what the secondary delete did.

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How much? If ever.
I will be able to churn these out quite rapidly if this one last test goes right. Like Michael Corleone's papa said. It will be an offer no one can refuse.
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      03-14-2013, 12:10 AM   #81
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i did want to take a spring break trip but its like a 40 hour drive each way.. do you intend on making more if these go well?
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      03-14-2013, 12:30 AM   #82
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i did want to take a spring break trip but its like a 40 hour drive each way.. do you intend on making more if these go well?
If this goes well then I know everything is set up properly to make more if people want them. I think I sent you my number. text me. we can talk.

I also, want to have mine ceramic coated and I have another design to test.
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      03-14-2013, 10:06 AM   #83
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Haha i think i deleted the pm actually. But yeah, let me know if anything comes up or you need more testers
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      03-14-2013, 10:16 AM   #84
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these look great.
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      03-14-2013, 04:07 PM   #85
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Thanks for the offer. my dyno tests showed 10whp gain and about 15wtq on a dynocom. How were your headers after dyno? I now have a secondary cat delete too. The smell of exhaust with the windows down is intolerable. Same thing for you? I will dyno again to see what the secondary delete did.

I'm still pouring all my money into my turbo e30 build. Have not dyno'd. Yes at stop signs it is smelly lol!
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      03-14-2013, 06:58 PM   #86
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Haha i think i deleted the pm actually. But yeah, let me know if anything comes up or you need more testers
your sig shows second cats deleted. I really wouldn't recommend you to go completely cat less. I can't roll down the windows period. If you idle for 5 minutes with the window down you will feel sick and maybe get a headache. I'd do primaries or secondaries. Not both.
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      03-14-2013, 07:47 PM   #87
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your sig shows second cats deleted. I really wouldn't recommend you to go completely cat less. I can't roll down the windows period. If you idle for 5 minutes with the window down you will feel sick and maybe get a headache. I'd do primaries or secondaries. Not both.
youre probably right. my noise level is pretty much where i want it to be anyways. I wouldnt mind some more power, but maybe with a tune ill be happier.. but i know what youre talking about. my friend's bike has no cats and its pretty bad, im sure a car engine would be even worse.
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      03-14-2013, 08:44 PM   #88
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Any type brand of cats will do instead of OEM ones?
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