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2010 2011 BMW 5 Series Forum F10 High Flow Catted Downpipe w Stock Exhaust |
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10-29-2019, 08:32 PM | #1 |
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High Flow Catted Downpipe w Stock Exhaust
Hey Guys,
Looking to see if anyone has a sound clip/video w a high flow catted downpipe still matched up with a stock exhaust. Ive been searching on YouTube, but coming up short. Thanks. |
10-31-2019, 08:16 AM | #2 | |
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Aftermarket downpipe with cat is 1 out of 50 transaction. So, to find someone that is in it and make a video about it, even more rare. But, from my experience of dealing with many of them. It sounds a little louder than stock. I would say about 30%-40% louder. Especially on cold start. But not as loud as catless.
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10-31-2019, 09:41 AM | #3 |
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I ran across a YouTube video of a stock exhaust with aftermarket DP awhile back but can't find it. it's pretty common most people run DP's with aftermarket exhaust vs with stock exhaust. doesn't make sense to run a DP with a factory exhaust since most people are looking for a louder sound. that video was a bit louder but nothing to justify upgrading the dp if you're looking for more grunt
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10-31-2019, 10:44 AM | #4 |
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I actually run this setup on my 535.
Stock exhaust with 200 CPSI catted RM downpipe (ebay) Sound increase is minimal. While cruising, I would say same as stock. When driving aggressively turbo whistle is more prevalent. I used to have a stock dp with M-performance exhaust, which caused excessive drone and why I went back to stock mufflers. I have a 6MT, so i think drone is more pronounced because of different (from 8at) cruise RPMs and using larger throttle inputs in higher gears (w/o downshifting). But now with hi-flow catted dp and stock exhaust no issues at all. I am using MHD stage1 with catted dp and upgraded intercooler. I was planning to run stage 2or 2+, but these mods improved the power delivery and spool enough, that I am sticking to stage1 for now. |
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10-31-2019, 10:55 AM | #5 | |
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The 535 Im looking for the same thing. Afraid a catless downpipe with the stock exhaust may be too loud. |
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10-31-2019, 12:03 PM | #6 | |
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11-01-2019, 07:24 PM | #7 |
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I am running a catless dp with stock exhaust. I wish it was slightly louder at times but i don't miss the droning associated with aftermarket dps.
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11-02-2019, 09:37 AM | #8 |
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Are you running a defouler to prevent the CEL since you don't have cats?
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11-02-2019, 08:45 PM | #9 |
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Negative! I am running a custom tune that takes care of any CELs that may otherwise show up. Bought the ER catless pipe here on the forums and love the power it makes.
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11-03-2019, 07:49 AM | #10 |
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I just installed Gutted OEM Down pipe on a meisterschaft full exhaust with Valve(s) delete.
Sounds great no drone at all. Defouler isnt working once i hit highway speed i got CEL. first week the smell was bad second week the smell was a little better third week way better but i still don't like it we are going to re-torque some bolts and put longer tips on if not better in 30 day i am going back to cat. The power is GREAT with out tune. |
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11-03-2019, 10:00 PM | #11 |
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Do you guys know if the car runs in limp mode or runs differently when the CEL light is on? I'm wondering if the car adjust because of the no cats?
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11-05-2019, 01:20 PM | #12 |
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Stock mufflers with any catless downpipe, car will not drone, slight increase (probably 5-10%) in sound.
M Performance with catless will drone. M performance with 200 cells downpipe will have less drone, but if you have PS2 turbo, you can reduce drone by adjusting wastegate to 6.5 inHg |
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11-05-2019, 02:54 PM | #13 |
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02-07-2022, 11:16 AM | #14 |
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Hello , im running a stock dp with a valvetronic armytrix exhaust from the cat and further .But im not very happy with the sound. Now looking what catted dp solutions i can find to make the sound louder. Reading though now it makes a slight only sound difference when catted im sceptical again ..
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02-07-2022, 02:35 PM | #15 | |
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02-08-2022, 12:47 PM | #16 |
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Yes idd catless sounds great , problem is its illegal here .So id have to mount it on and off at every yearly check we get in the Netherlands. Thus either this or stuck with a catted dp .I could match the dp to the exhaust from the same brand i suppose but i dont think armytrix makes also catted dp's? In the past i drove a 353 cabrio with dual m performance mufflers only and everything else stock , now i got a full armytrix with quad endpipes and still dont get the same sound loudness (or burbles) even though its both cars a n55 engine...Even removed all the insulation from the inside surface of the hood to "hear more" but all i got is the turbo hissing sound a bit louder only...Also plenty droning on low rpms(which i dont find bad btw)...Idk maybe it has to do with the "executive line" kinda feeling a limousine is supposed to have in contrast with the sportive loudness of a roadster chassis? Questions questions ..
Last edited by carbon535; 02-08-2022 at 12:58 PM.. |
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04-30-2022, 06:27 AM | #17 |
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Drives: BMW F11 535i MSport
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I run a catless dp with a M Performane exhaust on my F11, no drone or cel, louder on startup and when giving her beans otherwise sounds stock.
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535i F11 Msport, Masata IC, Masata Charge Pipe, Masata Turbo to IC pipe, BMS Air Intake, K+N Oil Filter, Catless DP, Stage 2.5, Brembo Brakes + EBC yellow pads.
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