AMG Performance Exhaust - Page 2 - Mercedes GLA Forum
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post #11 of 31 Old 04-11-2016, 07:52 PM
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Originally Posted by Tirgoman View Post
U21 is indeed AMG Performance Exhaust and it's a blast on my 2015 GLA 45AMG
Great, thanks for confirmation! I was a little disappointed when I thought you couldn't even order it as an option, this is a nice surprise.
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post #12 of 31 Old 04-11-2016, 10:55 PM Thread Starter
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I'm jealous! There must be a way to retrofit that thing!
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post #13 of 31 Old 05-28-2019, 03:10 PM
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Has anyone done the performance exhaust retrofit? I am looking into this as I didn't order my car with this option...
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post #14 of 31 Old 05-28-2019, 04:16 PM
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I disconnect that valve while it was open so its stays that all the time and sounds a little louder.
in C mode no pops, but still louder and sport and M will be pops.
C
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2015 GLA 45 DESIGNO MOUNTAIN GREY MATTE, 19"OZ ULTRALEGGERA HTL, AMS AIR INTAKE,AMS TITANIUM STRUT BAR, GIRO ROTORS, BRONDEX 200 cel DOWN PIPE, AMR PERFORMANCE STG2
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post #15 of 31 Old 05-29-2019, 09:55 AM
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Originally Posted by UKGLA45AMG View Post
I'm jealous! There must be a way to retrofit that thing!
Why not go with a cutout ? I think the AMG exhaust is too quiet.
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post #16 of 31 Old 05-30-2019, 12:29 PM
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i've been driving mostly in Sport mode since i like the suspension in comfort setting and transmission in auto. i just tried it out with individual mode with engine at Sport+ setting and the rest the same as Sport mode and i feel like the exhaust is significantly louder especially in 1st, 2nd and 3rd gear. i didn't think sport vs. sport+ would make that much difference.
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post #17 of 31 Old 07-28-2019, 12:42 AM
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Originally Posted by leeroy jenkins View Post
On this topic, I just decoded the VIN for my GLA45 that docked last week. Was running through the options just to check everything was there and noted it had U21 Sport Exhaust System. According to the ordering guide U21 is actually the AMG Performance Exhaust. Now in Australia they tend to put a lot of the "options" on as standard, and this could well be the case here, but I will be pleasantly surprised if it does indeed come with the AMG Exhaust.

Would anyone be able to confirm if I have U21 listed as an option that it is 100% the AMG Performance Exhaust, and I could expect to also have the dash button described above?
I don't have my build sheet at the moment, but generally the term "Sport Exhaust" means it is NOT the "Performance Exhaust".

That being said, they both have flaps that open up and change the sound. The PE setup being much more aggressive than the SE.
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post #18 of 31 Old 08-05-2019, 12:33 PM
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Sorry I'm late to this thread and sorry for the bad news, but "U21 Sport Exhaust" is NOT the same as "Performance Exhaust".

SE does have an electronic valve gate, but different piping and no exhaust button (it will automatically come on in sports mode).

PE has significantly different hardware underneath.
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post #19 of 31 Old 08-05-2019, 12:55 PM
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Originally Posted by Medtech View Post
Sorry I'm late to this thread and sorry for the bad news, but "U21 Sport Exhaust" is NOT the same as "Performance Exhaust".

SE does have an electronic valve gate, but different piping and no exhaust button (it will automatically come on in sports mode).

PE has significantly different hardware underneath.


I just checked with the order guide I used to order my GLA45 in 2017 for the 2018 model. The only exhaust option is U21 and it specifically called out there is a dedicated button on the dashboard. My car doesn't have this option, just the regular exhaust and I don't have a dedicated button for exhaust. See Attached screen shot.


So what is Performance Exhaust that is supposedly even more exotic than U21 Sport Exhaust?
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post #20 of 31 Old 08-05-2019, 02:34 PM
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Originally Posted by Sir Loin View Post
I just checked with the order guide I used to order my GLA45 in 2017 for the 2018 model. The only exhaust option is U21 and it specifically called out there is a dedicated button on the dashboard. My car doesn't have this option, just the regular exhaust and I don't have a dedicated button for exhaust. See Attached screen shot.


So what is Performance Exhaust that is supposedly even more exotic than U21 Sport Exhaust?
At this point I'm guessing that for some dumb reason the U21# is used for both.

The difference?? One again, my WAG...
1. the button on the dash,
2. a different resonator in the pipe, and
3. possibly some type of 2-pipe configuration mid-line.
...all just for sound and not for performance most likely

So it may be easier and cost effective to look at aftermarket
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