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      09-20-2017, 03:54 PM   #1
beachcomberx5
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ACS Exhaust Drone

I'm loving my new exhaust except for the highway drone at around 1800 rpms.

Any thoughts on how to fix. I tried sound insulation in the trunk but that only cut down 10%.

Is this something I have to live with or is there a practical solution. Maybe a reasonator?

I've asked the distributor to contact ACS but have not heard back.
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      09-21-2017, 12:55 PM   #2
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Set it to sport mode, it should help. I don't think you'll be able to get rid of it because of the nature of the SUV and it not having a trunk like a sedan or coupe.
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      09-21-2017, 01:07 PM   #3
beachcomberx5
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Quote:
Originally Posted by Mexecutioner View Post
Set it to sport mode, it should help. I don't think you'll be able to get rid of it because of the nature of the SUV and it not having a trunk like a sedan or coupe.
Funny you suggested that...I set it to sport mode last night for s short drive and it went away, plus even sounded better.

I wonder if MPPK would also help.

Not sure I understand the correlation btw exhaust sound vs Rpms vs cold start etc.
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      09-21-2017, 03:04 PM   #4
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Quote:
Originally Posted by beachcomberx5 View Post
Funny you suggested that...I set it to sport mode last night for s short drive and it went away, plus even sounded better.

I wonder if MPPK would also help.

Not sure I understand the correlation btw exhaust sound vs Rpms vs cold start etc.
resonance frequency changes with RPM
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      09-22-2017, 11:32 AM   #5
Mexecutioner
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Quote:
Originally Posted by beachcomberx5 View Post
Funny you suggested that...I set it to sport mode last night for s short drive and it went away, plus even sounded better.

I wonder if MPPK would also help.

Not sure I understand the correlation btw exhaust sound vs Rpms vs cold start etc.
I'm glad. I have mine on sport 99% of the time. I Have MPPK. I bet I would make your ACS sound even better.
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      09-22-2017, 12:20 PM   #6
beachcomberx5
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Quote:
Originally Posted by Mexecutioner View Post
Quote:
Originally Posted by beachcomberx5 View Post
Funny you suggested that...I set it to sport mode last night for s short drive and it went away, plus even sounded better.

I wonder if MPPK would also help.

Not sure I understand the correlation btw exhaust sound vs Rpms vs cold start etc.
I'm glad. I have mine on sport 99% of the time. I Have MPPK. I bet I would make your ACS sound even better.
Agreed I was thinking that MPPK was the next mod.
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      10-12-2017, 03:12 PM   #7
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i am thinking to go with it but with the black quad tips... i have racechip installed
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      10-12-2017, 03:56 PM   #8
beachcomberx5
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Quote:
Originally Posted by Vlado View Post
i am thinking to go with it but with the black quad tips... i have racechip installed
I have the black quad tips...I like the look
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      10-12-2017, 05:33 PM   #9
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Keeping it in Sport keeps it 7th gear, hence the higher rpm. Isn?t the ACS an axle back? If so you should have resonators on there still...I could be wrong but pretty certain that is the case. I had this problem with my Meisterschaft Exhaust on my last car and it annoyed the hell out of me
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      10-12-2017, 07:38 PM   #10
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Quote:
Originally Posted by beachcomberx5 View Post
I have the black quad tips...I like the look
do you have some good quality video ? Do you want to share it
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      10-12-2017, 07:52 PM   #11
beachcomberx5
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Quote:
Originally Posted by Vlado View Post
Quote:
Originally Posted by beachcomberx5 View Post
I have the black quad tips...I like the look
do you have some good quality video ? Do you want to share it
I will take some pics
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      10-12-2017, 07:55 PM   #12
beachcomberx5
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Here are a couple I had during install
Attached Images
  
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      10-13-2017, 12:14 AM   #13
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Quote:
Originally Posted by beachcomberx5 View Post
Here are a couple I had during install
did you delete the two resonators ? man i really want to hear that sound LOL .. i bet that black quad tips will looks amazing on my alpine white
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      10-13-2017, 05:18 AM   #14
beachcomberx5
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Quote:
Originally Posted by Vlado View Post
Quote:
Originally Posted by beachcomberx5 View Post
Here are a couple I had during install
did you delete the two resonators ? man i really want to hear that sound LOL .. i bet that black quad tips will looks amazing on my alpine white
I did not change the ACS exhaust.

There is a video by TAG Motorsports with the same exhaust on a 3.5. It sounds just like the video. Try searching and should be easy to find.
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      10-13-2017, 10:27 AM   #15
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Quote:
Originally Posted by Vlado View Post
did you delete the two resonators ? man i really want to hear that sound LOL .. i bet that black quad tips will looks amazing on my alpine white
Your car will sound different. His car is 35i, and yours is 50i.
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