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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > MPE vs Catless Downpipe N20
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      10-02-2019, 07:42 PM   #1
ZedPlays
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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.

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      10-02-2019, 08:20 PM   #2
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Downpipe, it provides power and sound.


For best sound, add the REMUS axle back
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      10-02-2019, 09:47 PM   #3
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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.
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      10-02-2019, 09:50 PM   #4
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I guess, on an N20 is not as shitty as an N26, since you dont have a second cat.
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      10-03-2019, 03:45 AM   #5
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Quote:
Originally Posted by ZedPlays View Post
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
Iím currently running a catless dp and the MPE and it sounds absolutely amazing so... why not both 😅
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      10-04-2019, 02:02 AM   #6
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Quote:
Originally Posted by prkr View Post
Iím currently running a catless dp and the MPE and it sounds absolutely amazing so... why not both 😅
Any video clips????
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      10-04-2019, 11:32 AM   #7
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Not much point in an intercooler if you don't upgrade the down pipe....
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      10-05-2019, 04:30 PM   #8
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Quote:
Originally Posted by Aldor27 View Post
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.
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      10-05-2019, 04:31 PM   #9
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Quote:
Originally Posted by CandyRedRC46 View Post
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.
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      10-12-2019, 12:42 AM   #10
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Quote:
Originally Posted by rjdnyy224 View Post
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?
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      10-12-2019, 12:09 PM   #11
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Quote:
Originally Posted by Photoman View Post
what's your channel name?
Ah that would've been a good thing to include lol.

It's just Ronnie DiMaggio
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      10-15-2019, 07:51 AM   #12
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Quote:
Originally Posted by rjdnyy224 View Post
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....
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      10-15-2019, 09:53 PM   #13
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Quote:
Originally Posted by CandyRedRC46 View Post
Yeah but you cant/shouldnt run stage 2 with just an intercooler and muffler....
Agreed, you need a downpipe.
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      10-16-2019, 08:12 AM   #14
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Long story short, you need a down pipe and intercooler, you dont need an axleback/catback...
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      10-16-2019, 10:13 PM   #15
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Quote:
Originally Posted by CandyRedRC46 View Post
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.
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      10-17-2019, 04:13 AM   #16
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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, 10:42 PM   #17
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I just installed ER downpipe on mine. Definitely sounds better especially with 335i exhaust also.
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      10-24-2019, 10:40 AM   #18
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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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      10-24-2019, 12:24 PM   #19
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Quote:
Originally Posted by Fastfishracing View Post
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.
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      10-28-2019, 03:59 AM   #20
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MPE for sound gains, Downpipe for performance gains.
Your decision
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