Downpipe worth it

nzuberi · 12-05-2022, 10:37 PM

Hi, I have a 2019 manual M4 and am contemplating a catted downpipe to go to stage 2 with bootmod3. Any advice if a downpipe is required to go to stage 2? What performance gains should I expect?

Pewtinn · 12-05-2022, 11:08 PM

Yes, I believe PTF recommends at least a high-flow catted DP if not catless for stage 2

F80RN · 12-05-2022, 11:11 PM

I'm running OEM Downpipes on the FlexFuel BM3 multi map and haven't had issues.

But (and I'm going to do this as well) send a log to PTF just for review and peace of mind. Worst case scenario the log is clean and you took some time to send an email

RoundelM3 · 12-06-2022, 07:29 AM

OP - remember that you have TWO downpipes on your S55 engine. Catted DPs will definitely make passing the emissions part of State inspection, and will also make the turbos spool up faster. Can't speak for the BM3 tune, but for my tune (Alpine Motorsports), only Stage 2+ requires non-stock DPs.

Kilabyte · 12-06-2022, 11:15 AM

You can run stage 2 BM3 with stock DPs, some here have been, nothing bad will happen, you're just leaving a tiny bit of performance/ spool time/ rasp on the table

rumzh · 12-06-2022, 12:17 PM

Anyone considering going downpipes + tune I recommend getting a custom tune. I was running the flexfuel OTS stage 2 BM3 tune for a couple months, went with a flexfuel f80Paul tune and it feels like a completely different car.

karimsaleh · 12-19-2022, 12:35 PM

Downpipes are absolutely worth it if you don't have/care about warranty. Car sounds amazing (catless dps for me) and the power gains are great with stage 2 bm3 tune.

12-05-2022, 10:37 PM	#1
nzuberi Enlisted Member 30 Rep 30 Posts Drives: 340 Join Date: May 2006 Location: Northern VA iTrader: (0)	Downpipe worth it Hi, I have a 2019 manual M4 and am contemplating a catted downpipe to go to stage 2 with bootmod3. Any advice if a downpipe is required to go to stage 2? What performance gains should I expect?
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12-05-2022, 11:08 PM	#2
Pewtinn First Lieutenant 112 Rep 347 Posts Drives: 2018 M3 Join Date: Jan 2021 Location: New York, NY iTrader: (0)	Yes, I believe PTF recommends at least a high-flow catted DP if not catless for stage 2
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12-05-2022, 11:11 PM	#3
F80RN Lieutenant 900 Rep 536 Posts Drives: f80 m3/2016 x3 Join Date: Mar 2021 Location: socal iTrader: (4)	I'm running OEM Downpipes on the FlexFuel BM3 multi map and haven't had issues. But (and I'm going to do this as well) send a log to PTF just for review and peace of mind. Worst case scenario the log is clean and you took some time to send an email
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12-06-2022, 07:29 AM	#4
RoundelM3 Major General 1840 Rep 6,992 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	OP - remember that you have TWO downpipes on your S55 engine. Catted DPs will definitely make passing the emissions part of State inspection, and will also make the turbos spool up faster. Can't speak for the BM3 tune, but for my tune (Alpine Motorsports), only Stage 2+ requires non-stock DPs. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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12-06-2022, 11:15 AM	#5
Kilabyte I'm Batman! 3949 Rep 1,477 Posts Drives: Mineral White M3 6MT Join Date: Jun 2019 Location: Massachusetts iTrader: (1)	You can run stage 2 BM3 with stock DPs, some here have been, nothing bad will happen, you're just leaving a tiny bit of performance/ spool time/ rasp on the table __________________ S55, 2JZ, M48.00
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12-06-2022, 12:17 PM	#6
rumzh Private First Class 61 Rep 101 Posts Drives: '18 F80 Join Date: Apr 2022 Location: CA iTrader: (0)	Anyone considering going downpipes + tune I recommend getting a custom tune. I was running the flexfuel OTS stage 2 BM3 tune for a couple months, went with a flexfuel f80Paul tune and it feels like a completely different car.
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12-19-2022, 12:35 PM	#7
karimsaleh New Member 3 Rep 7 Posts Drives: BMW F82 M4 Join Date: Dec 2022 Location: Houston, TX iTrader: (0)	Downpipes are absolutely worth it if you don't have/care about warranty. Car sounds amazing (catless dps for me) and the power gains are great with stage 2 bm3 tune.
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