[ember.m4]

Originally Posted by mike@x-ph.com

We offer this item on the website
https://x-ph.com/active-autowerke-g80-g82-m3-m4-signature-single-mid-pipe/

Gotcha, I'm interested, but I'd want to see what it sounds like first. Looking forward to your installation + sound video!

[mike@x-ph.com]

Originally Posted by sleepingplant

Gotcha, I'm interested, but I'd want to see what it sounds like first. Looking forward to your installation + sound video!

[findm3]

I have the same setup as the thread starter, anyone experiencing muffler rattles after doing so?

[OwnerF16]

Originally Posted by warcity

And here is my sound clip:

- Sports plus mode
- Secondary cat delete
- Primary Res deleted
- Secondary res NOT deleted

https://www.dropbox.com/s/zbl0n18mx0...%2026.mov?dl=0

thanks for the breakdown and the clip warcity Are you still running the same exhaust configuration? If so, any thought on doing it differently?

I'm about to install a set of Fabspeed Sport CAT down-pipes, don't want the high-pitch exhaust so I'm considering removing the secondary CATs and leaving both resonators for the deeper tones. TIA

[OwnerF16]

Originally Posted by Melsh113

Personally I found doing high flow primary cats on my car made a bigger difference then deleting my resonators and secondary cats. Obviously the secondary cat and resonator delete will add some sound to the car but not nearly as much as changing the primary cats did for me. Also, I dynoed my M3 and just from doing high flow cats I picked up an extra 20 whp which I was really surprised about. My M3 finally sounds like a true German performance car!

I just bought a set of Fabspeed's Sport CAT down pipes...curious which down pipes you installed? Any issues with a CEL? TIA

[mike@x-ph.com]

Originally Posted by OwnerF16

I just bought a set of Fabspeed's Sport CAT down pipes...curious which down pipes you installed? Any issues with a CEL? TIA

No CEL issue with the Fabspeed catted downpipes.

[OwnerF16]

Originally Posted by mike@x-ph.com

No CEL issue with the Fabspeed catted downpipes.

Thanks Mike

[mike@x-ph.com]

Originally Posted by OwnerF16

Thanks Mike

Let us know how it goes

[montrokc]

Originally Posted by warcity

And here is my sound clip:

- Sports plus mode
- Secondary cat delete
- Primary Res deleted
- Secondary res NOT deleted

https://www.dropbox.com/s/zbl0n18mx0...%2026.mov?dl=0

Bringing this back up from the way-back machine. The Dropbox link isn't functioning - can you upload a video of your exhaust with secondary cats removed and primary resonator? Don't think another video of this set up has been posted.

On my end, considering removing both resonators or doing secondary cat and primary resonator. Thanks!

[Sbm007]

Originally Posted by montrokc

Bringing this back up from the way-back machine. The Dropbox link isn't functioning - can you upload a video of your exhaust with secondary cats removed and primary resonator? Don't think another video of this set up has been posted.

On my end, considering removing both resonators or doing secondary cat and primary resonator. Thanks!

For what it's worth, the link works for me - I have mirrored it for you here if that helps: https://streamable.com/7xcsv6

[montrokc]

Originally Posted by Sbm007

For what it's worth, the link works for me - I have mirrored it for you here if that helps: https://streamable.com/7xcsv6

Thank you!

[MannyM5]

Originally Posted by montrokc

Bringing this back up from the way-back machine. The Dropbox link isn't functioning - can you upload a video of your exhaust with secondary cats removed and primary resonator? Don't think another video of this set up has been posted.

On my end, considering removing both resonators or doing secondary cat and primary resonator. Thanks!

Here is another pretty detailed video of secondary cats and primary resonator deleted. Sounds great.

https://youtu.be/MpUQKBDbUL4

[OwnerF16]

Originally Posted by mike@x-ph.com

High-flow cats sounded good with the X-pipe. The problem was the obnoxious cold start.

The single midpipe will sound a little better with the high-flow cats, but unless you are deleting the cold start, I recommend keeping the stock midpipe and getting an axle-back only if you are upgrading the downpipes.

Hey [mike@x-ph.com;29006240], thanks for all your input and feedback…it’s been a while so I wanted to ask. Is this still your standing recommendation for those of us installing high-flow CATs (stock mid & aftermarket axle-back)?

Going to have the CAT’d down pipes installed next month (Mar 23) and I was considering the resonated single mid-pipe based on the comments before reading this one.

Guess I’ll just have to wait and hear the exhaust one step at a time!

[mike@x-ph.com]

Originally Posted by OwnerF16

Hey [mike@x-ph.com;29006240], thanks for all your input and feedback…it’s been a while so I wanted to ask. Is this still your standing recommendation for those of us installing high-flow CATs (stock mid & aftermarket axle-back)?

Going to have the CAT’d down pipes installed next month (Mar 23) and I was considering the resonated single mid-pipe based on the comments before reading this one.

Guess I’ll just have to wait and hear the exhaust one step at a time!

i never tried the catted downpipes with the single resonated midpipe (which i have on the car now) but the single resonated is a quieter than the non res X-pipe, i dont think cold start will be nearly as bad.

[OwnerF16]

Some of you guys like the exhaust a little louder than my HOA can accept so it’s great to see and hear the variety and derivations based on what everyone is looking for, thanks for the videos and clips! Special thanks to TrentMeister, David92, Vic55, brooklyng80, warcity mike@x-ph.com for the great sound clips and advice….saving us all a lot of time and money. Glad to be joining this thread late so I can take advantage of not making multiple changes before I find what suits me.

I’m waiting on the install of high-flow CAT’d down pipes before I decide to install a resonated mid-pipe or retain the OE mid-pipe and just install an aftermarket axle-back exhaust. I may have missed it in the previous pages but I’ll drop a video after install of the new CAT’d down pipes if anyone is interested.

[OwnerF16]

Originally Posted by mike@x-ph.com

i never tried the catted downpipes with the single resonated midpipe (which i have on the car now) but the single resonated is a quieter than the non res X-pipe, i dont think cold start will be nearly as bad.

Thanks Mike, music to my ears!

[mike@x-ph.com]

Originally Posted by OwnerF16

Thanks Mike, music to my ears!

[montrokc]

Okay guys, want some advice please. I know a lot of this is subjective, but I have some parameters I hope will help.

I recently took delivery of my M3 (picture below for posterity) and love everything except the exterior sound - way too muted, and while it has a nice tone under load it doesn’t have that true sports car feel I’m after.

My overall plan is to one way or the other (via valve controller or physical modification) open the valves and leave them open - if I get a valve controller they will be open 90% of the time. This would be paired with some other exhaust modification.

Want to try going the cheaper route initially (for better or worse - why not), and if it doesn’t meet with what I’m wanting will get a manufactured mid pipe.

I want more sound, but am also aiming to stay warranted and want to be careful in that respect. My previous car was a 340i (B58) with port installed MPPSK exhaust and unplugged valves (permanently opened) - I LOVED the low grumble and general volume at start and under load. Aiming to replicate that level of sound (decibels but not tone, necessarily)… and not sure which route to go.

With all of this in mind, I would greatly appreciate your thoughts on whether to (a) remove secondary cats and first resonator, or (b) remove both resonators. I found a shop local to me that will do whichever route I request, with stainless steel straight pipes and TIG welding to finish the job well.

Promised photo(s):

[mike@x-ph.com]

Originally Posted by montrokc

Okay guys, want some advice please. I know a lot of this is subjective, but I have some parameters I hope will help.

I recently took delivery of my M3 (picture below for posterity) and love everything except the exterior sound - way too muted, and while it has a nice tone under load it doesn’t have that true sports car feel I’m after.

My overall plan is to one way or the other (via valve controller or physical modification) open the valves and leave them open - if I get a valve controller they will be open 90% of the time. This would be paired with some other exhaust modification.

Want to try going the cheaper route initially (for better or worse - why not), and if it doesn’t meet with what I’m wanting will get a manufactured mid pipe.

I want more sound, but am also aiming to stay warranted and want to be careful in that respect. My previous car was a 340i (B58) with port installed MPPSK exhaust and unplugged valves (permanently opened) - I LOVED the low grumble and general volume at start and under load. Aiming to replicate that level of sound (decibels but not tone, necessarily)… and not sure which route to go.

With all of this in mind, I would greatly appreciate your thoughts on whether to (a) remove secondary cats and first resonator, or (b) remove both resonators. I found a shop local to me that will do whichever route I request, with stainless steel straight pipes and TIG welding to finish the job well.

Removing the resonators or cats does not upgrade the sound. It makes it louder but also raspier and might introduce drone.

To upgrade the sound, you need to change the midpipe design.

Since the budget is a major concern, I recommend you get the MAD single midpipe.

Its most reasonably priced midpipe on the market and its a single design which offers a better sound than the stock midpipe design

[Info@mad-us.com]

Originally Posted by montrokc

Okay guys, want some advice please. I know a lot of this is subjective, but I have some parameters I hope will help.

I recently took delivery of my M3 (picture below for posterity) and love everything except the exterior sound - way too muted, and while it has a nice tone under load it doesn’t have that true sports car feel I’m after.

My overall plan is to one way or the other (via valve controller or physical modification) open the valves and leave them open - if I get a valve controller they will be open 90% of the time. This would be paired with some other exhaust modification.

Want to try going the cheaper route initially (for better or worse - why not), and if it doesn’t meet with what I’m wanting will get a manufactured mid pipe.

I want more sound, but am also aiming to stay warranted and want to be careful in that respect. My previous car was a 340i (B58) with port installed MPPSK exhaust and unplugged valves (permanently opened) - I LOVED the low grumble and general volume at start and under load. Aiming to replicate that level of sound (decibels but not tone, necessarily)… and not sure which route to go.

With all of this in mind, I would greatly appreciate your thoughts on whether to (a) remove secondary cats and first resonator, or (b) remove both resonators. I found a shop local to me that will do whichever route I request, with stainless steel straight pipes and TIG welding to finish the job well.

Promised photo(s):

Attachment 3119191

Attachment 3119192

Attachment 3119193

Beautiful car! If it were me I would just do our single mid-pipe and call it a day. If you want more sounds add an intake.

[MannyM5]

Originally Posted by montrokc

Okay guys, want some advice please. I know a lot of this is subjective, but I have some parameters I hope will help.

I recently took delivery of my M3 (picture below for posterity) and love everything except the exterior sound - way too muted, and while it has a nice tone under load it doesn’t have that true sports car feel I’m after.

My overall plan is to one way or the other (via valve controller or physical modification) open the valves and leave them open - if I get a valve controller they will be open 90% of the time. This would be paired with some other exhaust modification.

Want to try going the cheaper route initially (for better or worse - why not), and if it doesn’t meet with what I’m wanting will get a manufactured mid pipe.

I want more sound, but am also aiming to stay warranted and want to be careful in that respect. My previous car was a 340i (B58) with port installed MPPSK exhaust and unplugged valves (permanently opened) - I LOVED the low grumble and general volume at start and under load. Aiming to replicate that level of sound (decibels but not tone, necessarily)… and not sure which route to go.

With all of this in mind, I would greatly appreciate your thoughts on whether to (a) remove secondary cats and first resonator, or (b) remove both resonators. I found a shop local to me that will do whichever route I request, with stainless steel straight pipes and TIG welding to finish the job well.

Promised photo(s):

Attachment 3119191

Attachment 3119192

Attachment 3119193

Option A should have better tone and will be less raspy keeping the 1 resonator to merge pulses.
Or as others have said bite the bullet on a single Midpipe and call it a day.
Adding a valve controller is also likely worth while.

[ChrisM4]

Originally Posted by OwnerF16

I'm about to install a set of Fabspeed Sport CAT down-pipes, don't want the high-pitch exhaust so I'm considering removing the secondary CATs and leaving both resonators for the deeper tones. TIA

If you do this in stages I’d love to hear the stock exhaust with only the secondary cats removed. (All other resonators in place)