De- Cat MPE.

mark9661 · 06-11-2018, 06:26 PM

Who's gone the whole way and removed the primary and secondary cats with an MPE fitted to an M4? Too loud or just right? Opinions appreciated.

drgmt · 06-11-2018, 07:38 PM

Quote:

Originally Posted by mark9661

Who's gone the whole way and removed the primary and secondary cats with an MPE fitted to an M4? Too loud or just right? Opinions appreciated.

I removed the secondary cats and replaced them with two short segments of straight pipes - for me it was to loud and the rasp wasn't pleasant.

I now have the fabspeed x pipe with the MPE and It's just right.

Honeslty I wouldn't decat the downpipe unless you are planning on performance mods.

M4Dutch · 06-11-2018, 11:49 PM

I was running catless dp's with AA mid and MPE. Too loud for me, too much rasp and too much gas smell. Especially cause I'm driving a convertible.

Now back with stock dp's and AA mid with MPE it's just perfect. No more smell, no more rasp and sound is just spot on. Loud when you want it (sport and sport+) and quiet when you're cruising.

danniexi · 06-12-2018, 08:28 AM

maybe my hearing is gone but i have dps + mpe with the secondary cats and i still feel like its not loud enough. but i have a child and dont want to remove the secondary cats and expose her to fumes.

Brasko · 06-12-2018, 02:23 PM

I was considering a straight-thru mid-pipe that would pair with my MPE, but have the same concerns about drone and sound. Given the cost of current mid-pipe offerings, I'm considering building my own custom mid-pipe. Shouldn't be very difficult, especially if I use something like the VRSF or Fabspeed mid-pipe as a starting point. The ideal outcome would be a mid-pipe with a double barrel resonator and no catalytic converter or flex section.

Below are pics of the OEM F8X mid-pipe, Fabspeed mid-pipe and Borla resonator.

drgmt · 06-12-2018, 03:24 PM

For true sound quality without rasp, you have to keep one set of cats. Removing both is just to much for me.

drgmt · 06-12-2018, 03:25 PM

A resonator is not a bad way to add depth and tone without rasp. Wish I tried this myself. To late now.

Aapparition90 · 06-14-2018, 11:08 AM

Quote:

Originally Posted by drgmt

A resonator is not a bad way to add depth and tone without rasp. Wish I tried this myself. To late now.

V8 is the answer.. just not from M. X50i sounds nice though lol.

drgmt · 06-14-2018, 04:25 PM

Quote:

Originally Posted by Aapparition90

Quote:

Originally Posted by drgmt

A resonator is not a bad way to add depth and tone without rasp. Wish I tried this myself. To late now.

V8 is the answer.. just not from M. X50i sounds nice though lol.

Yeah I'm gonna sell the car in the next month or so.

Time to move on

Justin.AutoTalent · 06-16-2018, 01:09 PM

I just added downpipes to my MPE with Active, sounds awesome...

Aapparition90 · 06-18-2018, 10:02 AM

Quote:

Originally Posted by drgmt

Yeah I'm gonna sell the car in the next month or so.

Time to move on

Whats our there atm Glc63s / jag fpace svr might be decent.

Bluer2 · 06-18-2018, 01:32 PM

Quote:

Originally Posted by Justin.AutoTalent

I just added downpipes to my MPE with Active, sounds awesome...

What kind of rear spoiler and rear diffuser do you have on your car?

shay2nak · 06-18-2018, 10:50 PM

Quote:

Originally Posted by Bluer2

What kind of rear spoiler and rear diffuser do you have on your car?

Looks like a 3D Design spoiler and full PSM Dynamic diffuser.

06-11-2018, 06:26 PM	#1
mark9661 Private First Class 135 Rep 166 Posts Drives: M4 Black/Black Join Date: May 2015 Location: Cumbria UK. iTrader: (0)	De- Cat MPE. Who's gone the whole way and removed the primary and secondary cats with an MPE fitted to an M4? Too loud or just right? Opinions appreciated. Last edited by mark9661; 06-11-2018 at 06:37 PM..
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06-11-2018, 11:49 PM	#3
M4Dutch Private First Class 36 Rep 145 Posts Drives: 2019 BMW X5 40i xdrive Join Date: Feb 2018 Location: Huntington Beach, CA iTrader: (1) Garage List 2019 BMW X5 [0.00]	I was running catless dp's with AA mid and MPE. Too loud for me, too much rasp and too much gas smell. Especially cause I'm driving a convertible. Now back with stock dp's and AA mid with MPE it's just perfect. No more smell, no more rasp and sound is just spot on. Loud when you want it (sport and sport+) and quiet when you're cruising. __________________ F84 M4 2015 AA midpipe MPE carbon tips BM3 stage 1
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06-12-2018, 08:28 AM	#4
danniexi Brigadier General 3050 Rep 4,387 Posts Drives: 2022 F97 X3M Comp LCI Join Date: May 2008 Location: NJ/NY iTrader: (15) Garage List 2022 BMW X3M Compet ... [10.00] 2016 BMW F80 M3 [10.00]	maybe my hearing is gone but i have dps + mpe with the secondary cats and i still feel like its not loud enough. but i have a child and dont want to remove the secondary cats and expose her to fumes. __________________ BMW MY22 F97 X3MC LCI - CURRENT BUILD THREAD\| Instagram: @danniexi BMW MY16 F80 M3 - GONE BMW MY08 E92 335XI - GONE BMW MY06 E46 325XI - GONE
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06-12-2018, 02:23 PM	#5
Brasko #LSBM3 1419 Rep 1,973 Posts Drives: 2016 BMW M3 Join Date: Feb 2015 Location: Oregon / Florida iTrader: (4) Garage List 1984 BMW R65 [0.00] 2020 Ford F-150 XLT ... [0.00] 2003 Mitsubishi Evo ... [0.00] 2016 M3 Competition ... [10.00]	I was considering a straight-thru mid-pipe that would pair with my MPE, but have the same concerns about drone and sound. Given the cost of current mid-pipe offerings, I'm considering building my own custom mid-pipe. Shouldn't be very difficult, especially if I use something like the VRSF or Fabspeed mid-pipe as a starting point. The ideal outcome would be a mid-pipe with a double barrel resonator and no catalytic converter or flex section. Below are pics of the OEM F8X mid-pipe, Fabspeed mid-pipe and Borla resonator. Attached Images __________________ /// M3 Last edited by Brasko; 06-12-2018 at 02:28 PM..
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06-12-2018, 03:24 PM	#6
drgmt Lieutenant Colonel 985 Rep 1,885 Posts Drives: M4 Join Date: Apr 2017 Location: Australia iTrader: (1)	For true sound quality without rasp, you have to keep one set of cats. Removing both is just to much for me.
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06-12-2018, 03:25 PM	#7
drgmt Lieutenant Colonel 985 Rep 1,885 Posts Drives: M4 Join Date: Apr 2017 Location: Australia iTrader: (1)	A resonator is not a bad way to add depth and tone without rasp. Wish I tried this myself. To late now.
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06-16-2018, 01:09 PM	#10
Justin.AutoTalent Banned 3136 Rep 2,953 Posts Drives: F80 M3 Join Date: Jul 2016 Location: LA iTrader: (1)	I just added downpipes to my MPE with Active, sounds awesome...
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