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      04-21-2021, 08:06 PM   #23
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Initial impression after 1st resonator delete: very little increase in volume( 10% or less) More defined pop and crackle. Zero drone. If you are after more volume I say just do them both.
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      04-21-2021, 08:10 PM   #24
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Quote:
Originally Posted by weidake View Post
Initial impression after 1st resonator delete: very little increase in volume( 10% or less) More defined pop and crackle. Zero drone. If you are after more volume I say just do them both.
How many miles do you have on yours so far?
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      04-21-2021, 09:26 PM   #25
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Quote:
Originally Posted by LBbluem2 View Post
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Originally Posted by weidake View Post
Initial impression after 1st resonator delete: very little increase in volume( 10% or less) More defined pop and crackle. Zero drone. If you are after more volume I say just do them both.
How many miles do you have on yours so far?
total miles? Over 4000
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      04-21-2021, 11:30 PM   #26
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Quote:
Originally Posted by weidake View Post
Quote:
Originally Posted by LBbluem2 View Post
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Originally Posted by weidake View Post
Initial impression after 1st resonator delete: very little increase in volume( 10% or less) More defined pop and crackle. Zero drone. If you are after more volume I say just do them both.
How many miles do you have on yours so far?
total miles? Over 4000
Damn! Did your exhaust break in at all?
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      04-22-2021, 12:33 AM   #27
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Quote:
Originally Posted by weidake View Post
If you are after more volume I say just do them both.
*Speculation here* but I'm assuming that the second resonator has a merge of some sort as both 3 cylinder banks need to be merged at some point and on F8X and F97/8 it happens in the resonator - so just check that when you remove the second one, and be ready to weld in an H or X if needed. I only say this because on S55, not merging the pulses results in an even bigger doo-doo sound than stock... not advisable.

I think deleting the secondary cats will have the biggest impact on volume. There's no sensors on secondary cats on F8X or F97/8, so I assume there's no sensors on G8X.
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      04-22-2021, 09:21 AM   #28
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Quote:
Originally Posted by LBbluem2 View Post
Quote:
Originally Posted by weidake View Post
Quote:
Originally Posted by LBbluem2 View Post
Quote:
Originally Posted by weidake View Post
Initial impression after 1st resonator delete: very little increase in volume( 10% or less) More defined pop and crackle. Zero drone. If you are after more volume I say just do them both.
How many miles do you have on yours so far?
total miles? Over 4000
Damn! Did your exhaust break in at all?
I'm just drove 10 miles home under heavy traffic after the exhaust is done. I'll try to capture the sound later today
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      04-22-2021, 09:24 AM   #29
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Quote:
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Originally Posted by weidake View Post
If you are after more volume I say just do them both.
*Speculation here* but I'm assuming that the second resonator has a merge of some sort as both 3 cylinder banks need to be merged at some point and on F8X and F97/8 it happens in the resonator - so just check that when you remove the second one, and be ready to weld in an H or X if needed. I only say this because on S55, not merging the pulses results in an even bigger doo-doo sound than stock... not advisable.

I think deleting the secondary cats will have the biggest impact on volume. There's no sensors on secondary cats on F8X or F97/8, so I assume there's no sensors on G8X.
That's great information! If I do get the 2nd resonator delete I'll report back if there is H pipe in there. Also i checked secondary cat when the car was in the air. No sensors
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      04-24-2021, 02:18 PM   #30
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Looking forward to hearing some audio once you've dialed it in! Totally agree that the sound from factory is pretty tame
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      05-01-2021, 09:51 AM   #31
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I removed the primary resonator yesterday. Made a tiny tiny difference. I'm going back to remove secondary res. Agreed. It's quiet. Very quiet. My 2018 M440 was twice as loud.
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      05-01-2021, 09:56 AM   #32
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Quote:
Originally Posted by warcity View Post
I removed the primary resonator yesterday. Made a tiny tiny difference. I'm going back to remove secondary res. Agreed. It's quiet. Very quiet. My 2018 M440 was twice as loud.
Have you had someone rev it for you from the outside? Stock I louder than I thought.

The interior is just really well sound proofed.

In my m2c I ran with the back seats down at all times for more volume, maybe give that a shot too.
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      05-02-2021, 03:19 PM   #33
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Quote:
Originally Posted by LBbluem2 View Post
Quote:
Originally Posted by warcity View Post
I removed the primary resonator yesterday. Made a tiny tiny difference. I'm going back to remove secondary res. Agreed. It's quiet. Very quiet. My 2018 M440 was twice as loud.
Have you had someone rev it for you from the outside? Stock I louder than I thought.

The interior is just really well sound proofed.

In my m2c I ran with the back seats down at all times for more volume, maybe give that a shot too.
Great idea on the backseats down - thanks.
I'm going back for secondary cat delete later this month.

Sport plus is much louder than sport. Cold start sounds amazing. I just wish I could have the cold start sound all the time.
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      05-03-2021, 09:43 PM   #34
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Fwiw, I deleted the secondary cats and resonators from my X3MC via the Eisenmann mid pipe, and the volume difference was immense...

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      05-04-2021, 12:01 AM   #35
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Quote:
Originally Posted by LimeRock View Post
Fwiw, I deleted the secondary cats and resonators from my X3MC via the Eisenmann mid pipe, and the volume difference was immense...

Sounds good. Any drone at all?
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      05-04-2021, 06:42 AM   #36
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Quote:
Originally Posted by LimeRock View Post
Fwiw, I deleted the secondary cats and resonators from my X3MC via the Eisenmann mid pipe, and the volume difference was immense...

This is awesome. I'm going to do the same. Delete second secondary cat and delete primary res but will keep secondary res.

I too want to know - any droning?

Thanks for the vid.
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      05-04-2021, 08:14 AM   #37
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No drone whatsoever. I've gotten a lot of complements from people on the road. If I could pick on it, I would say there is slight rasp in the midrange under heavy throttle. Not bad like the S55, but not buttery smooth like the B58. Overall, I would highly recommend this setup until I see an equal length option come out.
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      05-04-2021, 02:02 PM   #38
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Quote:
Originally Posted by LimeRock View Post
No drone whatsoever. I've gotten a lot of complements from people on the road. If I could pick on it, I would say there is slight rasp in the midrange under heavy throttle. Not bad like the S55, but not buttery smooth like the B58. Overall, I would highly recommend this setup until I see an equal length option come out.
Great stuff--- how much "less" sound would you guess I would gain if I just removed the front and aft resonators leaving the secondary cats (for now)?
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      05-04-2021, 02:42 PM   #39
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Quote:
Originally Posted by LimeRock View Post
No drone whatsoever. I've gotten a lot of complements from people on the road. If I could pick on it, I would say there is slight rasp in the midrange under heavy throttle. Not bad like the S55, but not buttery smooth like the B58. Overall, I would highly recommend this setup until I see an equal length option come out.
This is so great. I'm excited. By end of April mine will be deleted.
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      05-04-2021, 02:45 PM   #40
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Quote:
Originally Posted by LimeRock View Post
No drone whatsoever. I've gotten a lot of complements from people on the road. If I could pick on it, I would say there is slight rasp in the midrange under heavy throttle. Not bad like the S55, but not buttery smooth like the B58. Overall, I would highly recommend this setup until I see an equal length option come out.
I wonder if your setup not being equal length is causing the slight raspiness. I have an appointment with someone who is going to create a mid section with equal lengths. He makes a ton of custom Ti exhausts locally so I trust his work.

There is a company that claims their midpipe is equal length but they are asking $1900 for it LOL.
https://valvetronic.com/collections/...m4-g8x-midpipe

Last edited by ///MeraldCity_G82; 05-04-2021 at 08:46 PM..
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      05-05-2021, 03:13 AM   #41
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Quote:
Originally Posted by Vic55 View Post
Quote:
Originally Posted by LimeRock View Post
No drone whatsoever. I've gotten a lot of complements from people on the road. If I could pick on it, I would say there is slight rasp in the midrange under heavy throttle. Not bad like the S55, but not buttery smooth like the B58. Overall, I would highly recommend this setup until I see an equal length option come out.
Great stuff--- how much "less" sound would you guess I would gain if I just removed the front and aft resonators leaving the secondary cats (for now)?
I would imagine it's somewhat comparable, albeit quieter. A few others on the X3M forums have done this and appeared pleased.
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      05-05-2021, 03:21 AM   #42
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Quote:
Originally Posted by BSM_G808 View Post
Quote:
Originally Posted by LimeRock View Post
No drone whatsoever. I've gotten a lot of complements from people on the road. If I could pick on it, I would say there is slight rasp in the midrange under heavy throttle. Not bad like the S55, but not buttery smooth like the B58. Overall, I would highly recommend this setup until I see an equal length option come out.
I wonder if your setup not being equal length is causing the slight raspiness. I have an appointment with someone who is going to create a mid section with equal lengths. He makes a ton of custom Ti exhausts locally so I trust his work.

There is a company that claims their midpipe is equal length but they are asking $1900 for it LOL.
https://valvetronic.com/collections/...m4-g8x-midpipe
It's possible, the eisenmann midpipe is straight through, with no x/h-pipe. No one currently makes an equal length solution for the X3M platform, unfortunately. $1900 is steep, equal length or not...I'd love to hear a clip if you go the custom fabrication route...I was thinking about that too.

As strange as it may seem, I have a feeling the rasp is related to the OEM muffler more than the mid pipe. The valve operation is somewhat bizarre, and unless you are at WOT before 4-4.5k RPM, the system seems to keep valves partially closed in that range (perhaps for a performance reason?). I think this is the cause of the slight rasp. It's possible the M3/4 have a revised design / software, as us X3M guys have had trouble with the OEM valve operation (rattles).
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      05-13-2021, 09:03 PM   #43
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Back with an update:

Primary res was deleted few weeks back 5% sound increase.

Secondary cat was deleted today. Much better. 30% sound increase. No droning. Sounds good.
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      05-13-2021, 11:10 PM   #44
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Quote:
Originally Posted by warcity View Post
Back with an update:

Primary res was deleted few weeks back 5% sound increase.

Secondary cat was deleted today. Much better. 30% sound increase. No droning. Sounds good.
Any CEL with deleting the secondary cat?
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