MPE vs Catless Downpipe N20

ZedPlays · 10-02-2019, 06:42 PM

Hi guys, I current have a 2015 BMW 428. I currently have stage 1 93 octane tune on. I just bought a intercooler and I am trying to see if I should get a MPE or a downpipe? What are the benefits? I want to start my car and hear a nice little roar. Preferably no loud droning noise.

Thanks

mike@x-ph.com · 10-02-2019, 07:20 PM

Downpipe, it provides power and sound.

For best sound, add the REMUS axle back

esoj37 · 10-02-2019, 08:47 PM

Youll need an exhaust after putting a downpipe on an N20/N26. It will sound like crap with the stock exhaust. Been there, done that.

esoj37 · 10-02-2019, 08:50 PM

I guess, on an N20 is not as shitty as an N26, since you dont have a second cat.

prkr · 10-03-2019, 02:45 AM

Quote:

Originally Posted by ZedPlays

Hi guys, I current have a 2015 BMW 428. I currently have stage 1 93 octane tune on. I just bought a intercooler and I am trying to see if I should get a MPE or a downpipe? What are the benefits? I want to start my car and hear a nice little roar. Preferably no loud droning noise.

Thanks

I’m currently running a catless dp and the MPE and it sounds absolutely amazing so... why not both 😅

Aldor27 · 10-04-2019, 01:02 AM

Quote:

Originally Posted by prkr

I’m currently running a catless dp and the MPE and it sounds absolutely amazing so... why not both 😅

Any video clips????

CandyRedRC46 · 10-04-2019, 10:32 AM

Not much point in an intercooler if you don't upgrade the down pipe....

rjd_F30 · 10-05-2019, 03:30 PM

Quote:

Originally Posted by Aldor27

Any video clips????

I've got plenty of catless + MPE clips on my YouTube channel if you're looking to get an idea of what it sounds like.

rjd_F30 · 10-05-2019, 03:31 PM

Quote:

Originally Posted by CandyRedRC46

Not much point in an intercooler if you don't upgrade the down pipe....

Not really... An intercooler will lower IATs on a stock car too, which is certainly "a point" enough to me.

Photoman · 10-11-2019, 11:42 PM

Quote:

Originally Posted by rjdnyy224

I've got plenty of catless + MPE clips on my YouTube channel if you're looking to get an idea of what it sounds like.

what's your channel name?

rjd_F30 · 10-12-2019, 11:09 AM

Quote:

Originally Posted by Photoman

what's your channel name?

Ah that would've been a good thing to include lol.

It's just Ronnie DiMaggio

CandyRedRC46 · 10-15-2019, 06:51 AM

Quote:

Originally Posted by rjdnyy224

Not really... An intercooler will lower IATs on a stock car too, which is certainly "a point" enough to me.

Yeah but you cant/shouldnt run stage 2 with just an intercooler and muffler....

rjd_F30 · 10-15-2019, 08:53 PM

Quote:

Originally Posted by CandyRedRC46

Yeah but you cant/shouldnt run stage 2 with just an intercooler and muffler....

Agreed, you need a downpipe.

CandyRedRC46 · 10-16-2019, 07:12 AM

Long story short, you need a down pipe and intercooler, you dont need an axleback/catback...

rjd_F30 · 10-16-2019, 09:13 PM

Quote:

Originally Posted by CandyRedRC46

Long story short, you need a down pipe and intercooler, you dont need an axleback/catback...

Well, yes, to run stage 2 you need an FMIC and downpipe upgrade. But he was just asking how to make his car sound better, and the simple answer is an axle back.

bropsy · 10-17-2019, 03:13 AM

Downpipe would be most beneficial, Especially with the appropriate MAP.

Went downpipe first with stock exhaust. Results were increased overall loudness similar to or just a tad bit over just an axleback mod. Burbles sounds most apparent change.

After adding AWE touring axle back with the downpipe. Resulted in double the previous volume similar to catback only mod. Burble pops can turn into gunshots.

I imaging DP and catback would be a whole step louder than a typical catback only mod. IF you were trying to get to that level. :P

xcviwp6 · 10-21-2019, 09:42 PM

I just installed ER downpipe on mine. Definitely sounds better especially with 335i exhaust also.

Fastfishracing · 10-24-2019, 09:40 AM

Does an N20 just have the cat in the DP, or is there another as well, meaning with catless DP it could still get through an MOT in the UK?

MacklinUSOB · 10-24-2019, 11:24 AM

Quote:

Originally Posted by Fastfishracing

Does an N20 just have the cat in the DP, or is there another as well, meaning with catless DP it could still get through an MOT in the UK?

N20 is a single cat design which is in the downpipe. N26 has an additional cat in the midpipe. Definitely wouldn't pass any emissions test without a cat. Thankfully a downpipe is not difficult to replace when time for an emissions test.

leeicedtea · 10-28-2019, 02:59 AM

MPE for sound gains, Downpipe for performance gains.
Your decision

10-02-2019, 06:42 PM	#1
ZedPlays Enlisted Member 3 Rep 36 Posts Drives: 2015 BMW 428 xDrive Join Date: Jan 2019 Location: Chicago iTrader: (0)	MPE vs Catless Downpipe N20 Hi guys, I current have a 2015 BMW 428. I currently have stage 1 93 octane tune on. I just bought a intercooler and I am trying to see if I should get a MPE or a downpipe? What are the benefits? I want to start my car and hear a nice little roar. Preferably no loud droning noise. Thanks
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10-02-2019, 07:20 PM	#2
mike@x-ph.com BimmerPost Supporting Vendor 24095 Rep 190,633 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Downpipe, it provides power and sound. For best sound, add the REMUS axle back __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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10-02-2019, 08:47 PM	#3
esoj37 Lieutenant 156 Rep 461 Posts Drives: M2C 6MT Join Date: Feb 2017 Location: New Orleans iTrader: (12)	Youll need an exhaust after putting a downpipe on an N20/N26. It will sound like crap with the stock exhaust. Been there, done that. __________________ HS S55 F87 MG B58 F30 - Gone MG N20 F30 - Gone
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10-02-2019, 08:50 PM	#4
esoj37 Lieutenant 156 Rep 461 Posts Drives: M2C 6MT Join Date: Feb 2017 Location: New Orleans iTrader: (12)	I guess, on an N20 is not as shitty as an N26, since you dont have a second cat. __________________ HS S55 F87 MG B58 F30 - Gone MG N20 F30 - Gone
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10-04-2019, 10:32 AM	#7
CandyRedRC46 Lieutenant 242 Rep 420 Posts Drives: 2013 328i Join Date: Feb 2018 Location: Florida iTrader: (0)	Not much point in an intercooler if you don't upgrade the down pipe....
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10-16-2019, 07:12 AM	#14
CandyRedRC46 Lieutenant 242 Rep 420 Posts Drives: 2013 328i Join Date: Feb 2018 Location: Florida iTrader: (0)	Long story short, you need a down pipe and intercooler, you dont need an axleback/catback...
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10-17-2019, 03:13 AM	#16
bropsy Registered 0 Rep 2 Posts Drives: 2016 428i M-Sport Coupe Join Date: Oct 2019 Location: Los Angeles, CA iTrader: (0)	Downpipe would be most beneficial, Especially with the appropriate MAP. Went downpipe first with stock exhaust. Results were increased overall loudness similar to or just a tad bit over just an axleback mod. Burbles sounds most apparent change. After adding AWE touring axle back with the downpipe. Resulted in double the previous volume similar to catback only mod. Burble pops can turn into gunshots. I imaging DP and catback would be a whole step louder than a typical catback only mod. IF you were trying to get to that level. :P
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10-21-2019, 09:42 PM	#17
xcviwp6 Enlisted Member 8 Rep 42 Posts Drives: BMW 328i M-Sport Join Date: Oct 2018 Location: NJ iTrader: (0)	I just installed ER downpipe on mine. Definitely sounds better especially with 335i exhaust also.
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10-24-2019, 09:40 AM	#18
Fastfishracing Registered 0 Rep 1 Posts Drives: BMW F30 328i Join Date: Oct 2019 Location: Surrey, UK iTrader: (0)	Does an N20 just have the cat in the DP, or is there another as well, meaning with catless DP it could still get through an MOT in the UK?
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10-28-2019, 02:59 AM	#20
leeicedtea New Member 3 Rep 13 Posts Drives: BMW F30 328i Join Date: Sep 2019 Location: Tampa, FL iTrader: (0)	MPE for sound gains, Downpipe for performance gains. Your decision
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