Modifying BW xpipe

pooyab · 01-17-2022, 01:24 AM

On my first M3 I had BWs catless xpipe with resonators paired to a GT2. It sounded fantastic and it was loud. This time I want loud but not as loud and no smell.
Now I have this BW xpipe that's full straight piped. I bought 2 12" Vibrant resonators (use them on my Abarth and it sounds great) and 2 4" HJS 200cel cats. My plan was to build a system that has the relocated X with less drone and no scent. It'll be paired to Eisenmann Race.
After lining it up I'm not sure it'll all fit. I'll still take it to a shop to see what they say but does anyone else here have some ideas in case it doesn't work? My back up plan is the Challenge Sport xpipe.

jp1984 · 01-17-2022, 09:17 PM

cool, keep us posted, curious to see how it turns out.

amrazM · 01-18-2022, 05:15 AM

for the sake of space you may have to put the cats in the primary position, the resonators will go at the rear.

Rochen_00 · 01-20-2022, 04:58 AM

I would first try to mount only the cats, if later it still sounds very loud I would add the resonators

christoepurrr · 01-20-2022, 09:07 AM

I'm not sure of the dimensions of your HJS HFCs, but I believe there have been members that have installed Magnaflow HFCs (59956 / 4" body width, 8" body length) in the secondary position with Vibrant 12" resonators mounted at the rear.

Assuming the HJS HFCs have similar dimensions as the Magnaflows, I think you should be fine.

SYT_Shadow · 01-20-2022, 12:08 PM

it should fit after the X

pooyab · 01-20-2022, 11:28 PM

Still trying to find a shop that I can trust to do it. Most places around here are typical muffler chop shops and I've seen those welds.
Going to target after the x, but worst case will do in the primary location. Didn't think of that earlier for some reason.
Will update with how it turned out after

dfwashere · 01-21-2022, 10:41 AM

Quote:

Originally Posted by pooyab

Still trying to find a shop that I can trust to do it. Most places around here are typical muffler chop shops and I've seen those welds.
Going to target after the x, but worst case will do in the primary location. Didn't think of that earlier for some reason.
Will update with how it turned out after

Try Sounds of Speed Performance in Santa Clara. ive heard good things.

derbo · 01-21-2022, 04:48 PM

Quote:

Originally Posted by pooyab

Still trying to find a shop that I can trust to do it. Most places around here are typical muffler chop shops and I've seen those welds.
Going to target after the x, but worst case will do in the primary location. Didn't think of that earlier for some reason.
Will update with how it turned out after

outside of a shop, friend does some wonderful custom welding. You can see some of his work on his IG. He is the south bay

UBERV8 · 01-24-2022, 12:12 AM

I had a BW X pipe with 2 MF HFC's and vibrant resonators and it sounded phenomenal. I bought it from the previous owner so not sure about the details.

01-17-2022, 01:24 AM	#1
pooyab Major 330 Rep 1,158 Posts Drives: 2011 BMW M3 2020 BMW M5C Join Date: Jan 2014 Location: Bay Area, CA iTrader: (2) Garage List 2011 BMW M3 [0.00]	Modifying BW xpipe On my first M3 I had BWs catless xpipe with resonators paired to a GT2. It sounded fantastic and it was loud. This time I want loud but not as loud and no smell. Now I have this BW xpipe that's full straight piped. I bought 2 12" Vibrant resonators (use them on my Abarth and it sounds great) and 2 4" HJS 200cel cats. My plan was to build a system that has the relocated X with less drone and no scent. It'll be paired to Eisenmann Race. After lining it up I'm not sure it'll all fit. I'll still take it to a shop to see what they say but does anyone else here have some ideas in case it doesn't work? My back up plan is the Challenge Sport xpipe. Attached Images __________________ Interlagos Blue/Speed Cloth \| BayOptiks DTM Headlights \| Alpine Stage 2 \| KW Clubsport \| Resonated X-Pipe \| Eisenmann Race \| StopTech BBK \| TE37SL \| YFCM CF Driveshaft \| Hotchkis F/R Sways \| F/R Endlinks \| Turner Control Arms and Front Tension Bushings \| Powerflex Diff Bushings \| Turner Solid Subframe Bushings \| MS Underdrive Pulley and Intake \| Alpine DCT Tune \| Karbonius Intake \| Carbon Roof (TBD)
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01-17-2022, 09:17 PM	#2
jp1984 Lieutenant 506 Rep 550 Posts Drives: an E92 Join Date: Jun 2019 Location: under the hood again iTrader: (0)	cool, keep us posted, curious to see how it turns out.
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01-18-2022, 05:15 AM	#3
amrazM mTekMods 2142 Rep 2,901 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	for the sake of space you may have to put the cats in the primary position, the resonators will go at the rear. __________________ 2011 Frozen Black/Fox Red E90 M3 650+WHP G-Power Supercharged First DCT to Manual Conversion Worldwide KW CS, BBS RI-A, BW Headers, Snow 2.5
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01-20-2022, 04:58 AM	#4
Rochen_00 Second Lieutenant 350 Rep 259 Posts Drives: M3 e92 Join Date: Feb 2018 Location: Catalonia iTrader: (0)	I would first try to mount only the cats, if later it still sounds very loud I would add the resonators __________________ Instagram: @m_rochen Alpinemss Tuned \| Tecnocraft E9X ///M3 Envy™ Intake System \| MS Pulleys \| Akrapovic Evolution Exhaust \| Ohlins Road&track\| BBK Brembo 6p Front & Brembo 4p Rear\| H&R Stabilisator\| Solid subframe bushings\| full spherical bushings\| Recaro pole position
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01-20-2022, 09:07 AM	#5
christoepurrr Lieutenant 156 Rep 443 Posts Drives: BMW M3 Join Date: May 2015 Location: So. Cal iTrader: (2)	I'm not sure of the dimensions of your HJS HFCs, but I believe there have been members that have installed Magnaflow HFCs (59956 / 4" body width, 8" body length) in the secondary position with Vibrant 12" resonators mounted at the rear. Assuming the HJS HFCs have similar dimensions as the Magnaflows, I think you should be fine.
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01-20-2022, 12:08 PM	#6
SYT_Shadow ///M Powered for Life 11480 Rep 10,328 Posts Drives: E90M/E92M/M4GTS/M4GT4/X5M Join Date: Sep 2010 Location: Greenwich, CT iTrader: (2)	it should fit after the X __________________ DIY: S65 Rod Bearings E9X PFC Z54 BBK on F8X BK harness bar + seats: fit 6 tires in an M3 do88 Cooling Goodies GTS Twins: GTMore project
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01-20-2022, 11:28 PM	#7
pooyab Major 330 Rep 1,158 Posts Drives: 2011 BMW M3 2020 BMW M5C Join Date: Jan 2014 Location: Bay Area, CA iTrader: (2) Garage List 2011 BMW M3 [0.00]	Still trying to find a shop that I can trust to do it. Most places around here are typical muffler chop shops and I've seen those welds. Going to target after the x, but worst case will do in the primary location. Didn't think of that earlier for some reason. Will update with how it turned out after __________________ Interlagos Blue/Speed Cloth \| BayOptiks DTM Headlights \| Alpine Stage 2 \| KW Clubsport \| Resonated X-Pipe \| Eisenmann Race \| StopTech BBK \| TE37SL \| YFCM CF Driveshaft \| Hotchkis F/R Sways \| F/R Endlinks \| Turner Control Arms and Front Tension Bushings \| Powerflex Diff Bushings \| Turner Solid Subframe Bushings \| MS Underdrive Pulley and Intake \| Alpine DCT Tune \| Karbonius Intake \| Carbon Roof (TBD)
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01-24-2022, 12:12 AM	#10
UBERV8 Major 528 Rep 1,185 Posts Drives: '13 MW E92 M3 Join Date: Jan 2011 Location: SoCal iTrader: (8)	I had a BW X pipe with 2 MF HFC's and vibrant resonators and it sounded phenomenal. I bought it from the previous owner so not sure about the details. Attached Images
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