Help needed installing a HJS Downpipe

M4Latt · 05-27-2023, 07:39 AM

Hello bimmers

I'm about to buy the HJS DP for my M4 F82 and I need a little advice from someone who has installed it themselves. According to HJS instructions you have to lift the engine 2cm. Is this really necessary or can I get the DP in without having to bend/damage anything? Thank you

RoundelM3 · 05-27-2023, 07:48 AM

FYI, you have two downpipes on your S55 engine. You might try posting in the Coding/DIY section of this forum.

HONGCHUMZI · 05-27-2023, 07:55 AM

Yes, it is. Please refer to the manual to install it. I didn't get in without lifting the engine.

YMB-M3-J2 · 05-28-2023, 09:46 PM

Well I installed my down pipes (not HJS) on jack stands in my garage and I absolutely did NOT raise my engine, the install isn’t really that hard, just time consuming since it’s a tight space to work in.

aa2033 · 05-29-2023, 04:59 AM

I did not need to lift my engine for my resonated downpipes. Googling the hjs they are pretty large because they are catted. There's a good possibility you will have to, to install them.

Honestly from my research the oem cats flow very well. I don't see the point of high flow cats unless you're going over 750whp.

Jbonly21 · 05-29-2023, 10:37 PM

Just did my, took me about 4 hours, you do not need to lift the engine. BMW F80 M3 AND F82 M4 DOWNPIPES DIY! (ARM DOWNPIPES)
https://youtu.be/sCTKGWVLmEw

05-27-2023, 07:39 AM	#1
M4Latt Registered 0 Rep 1 Posts Drives: BMW M4 F82 2015 Join Date: May 2023 Location: NY iTrader: (0)	Help needed installing a HJS Downpipe Hello bimmers I'm about to buy the HJS DP for my M4 F82 and I need a little advice from someone who has installed it themselves. According to HJS instructions you have to lift the engine 2cm. Is this really necessary or can I get the DP in without having to bend/damage anything? Thank you
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05-27-2023, 07:48 AM	#2
RoundelM3 Major General 1833 Rep 6,987 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Wendell, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	FYI, you have two downpipes on your S55 engine. You might try posting in the Coding/DIY section of this forum. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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05-27-2023, 07:55 AM	#3
HONGCHUMZI Slave at the company 234 Rep 58 Posts Drives: BMW M3 F80 Join Date: Feb 2020 Location: South Korea iTrader: (0) Garage List 2017 BMW M3 [9.29]	Yes, it is. Please refer to the manual to install it. I didn't get in without lifting the engine.
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05-28-2023, 09:46 PM	#4
YMB-M3-J2 Major 258 Rep 1,309 Posts Drives: YMB M3 Join Date: Jan 2010 Location: South Florida iTrader: (0) Garage List 2016 BMW X6M [0.00] 2018 BMW M3 [0.00] 2015 BMW X4 35i [0.00] 2015 BMW M4 (SOLD) [0.00] 2012 BMW 328i SL(SOLD) [0.00] 2008 BMW 328i (SOLD) [0.00] 2007 C230 Komp (SOLD) [0.00] 1999 BMW 328i (SOLD) [0.00]	Well I installed my down pipes (not HJS) on jack stands in my garage and I absolutely did NOT raise my engine, the install isn’t really that hard, just time consuming since it’s a tight space to work in.
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05-29-2023, 04:59 AM	#5
aa2033 Second Lieutenant 375 Rep 212 Posts Drives: 2018 BMW M3 Join Date: May 2022 Location: Virginia iTrader: (0)	I did not need to lift my engine for my resonated downpipes. Googling the hjs they are pretty large because they are catted. There's a good possibility you will have to, to install them. Honestly from my research the oem cats flow very well. I don't see the point of high flow cats unless you're going over 750whp.
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05-29-2023, 10:37 PM	#6
Jbonly21 Captain 1070 Rep 884 Posts Drives: Bmw 15 F80, 2011 X5 35i, E46 M Join Date: Mar 2019 Location: Los Angeles iTrader: (2)	Just did my, took me about 4 hours, you do not need to lift the engine. BMW F80 M3 AND F82 M4 DOWNPIPES DIY! (ARM DOWNPIPES) https://youtu.be/sCTKGWVLmEw __________________ https://youtube.com/user/Jbonly21
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