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      04-14-2021, 01:00 PM   #1
TrentMeister
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Anyone cut out secondary cats or resonators yet?

This thing is way to quiet.

It's making me miss the sound of the s55.

Update: I pulled both resonators(incredibly light) and had an xpipe put in place and damn...

The sound is 100% how it should have come from factory.

Super smooth, throaty, and has a nice ascending pitch as you move through the RPM's.

It's not loud but adds volume to the entire rev range giving you some much needed sports car sound.

I paid 200$

Here's a few videos my woman took for me.. I'll get a better comprehensive set of videos soon.

The video's with the standing revs should have just been 1 but it cutout for the majority of the midrange.

Notice 0 rasp at top end.

Also the footage is dramatically better with headphones



https://youtube.com/shorts/RSS839HpbnQ?feature=share


https://youtube.com/shorts/Q8QxKT7GcZA?feature=share


https://youtube.com/shorts/JpqEJpkXr1E?feature=share


https://youtube.com/shorts/pngaygILHkk?feature=share


https://youtube.com/shorts/0Zy65tl54vw?feature=share
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      04-14-2021, 01:33 PM   #2
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Quote:
Originally Posted by LBbluem2 View Post
Anyone cut out secondary cats or resonators yet?

This thing is way to quiet.

It's making me miss the sound of the s55.
Not affiliated with them in any way, but Valvetronic has a mid pipe in development for the G8x:
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      04-14-2021, 06:38 PM   #3
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Quote:
Originally Posted by jonahk View Post
Quote:
Originally Posted by LBbluem2 View Post
Anyone cut out secondary cats or resonators yet?

This thing is way to quiet.

It's making me miss the sound of the s55.
Not affiliated with them in any way, but Valvetronic has a mid pipe in development for the G8x:
Yeah I saw that,

But if I can just go down to a exhaust shop and have them cut out the secondary's and the resonator so it's just straight through pipes and get a good sound..

I'd do that for sure..

It seems like I may have to be the guy to take one for the team and see how it sounds myself.
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      04-15-2021, 02:47 PM   #4
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Quote:
Originally Posted by LBbluem2 View Post
Quote:
Originally Posted by jonahk View Post
Quote:
Originally Posted by LBbluem2 View Post
Anyone cut out secondary cats or resonators yet?

This thing is way to quiet.

It's making me miss the sound of the s55.
Not affiliated with them in any way, but Valvetronic has a mid pipe in development for the G8x:
Yeah I saw that,

But if I can just go down to a exhaust shop and have them cut out the secondary's and the resonator so it's just straight through pipes and get a good sound..

I'd do that for sure..

It seems like I may have to be the guy to take one for the team and see how it sounds myself.
just delete the resonator should do the trick. Deleting both 2nd cat and resonator may give you bad drone. Please let us know how it sounds
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      04-15-2021, 03:46 PM   #5
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Quote:
Originally Posted by weidake View Post
Quote:
Originally Posted by LBbluem2 View Post
Quote:
Originally Posted by jonahk View Post
Quote:
Originally Posted by LBbluem2 View Post
Anyone cut out secondary cats or resonators yet?

This thing is way to quiet.

It's making me miss the sound of the s55.
Not affiliated with them in any way, but Valvetronic has a mid pipe in development for the G8x:
Yeah I saw that,

But if I can just go down to a exhaust shop and have them cut out the secondary's and the resonator so it's just straight through pipes and get a good sound..

I'd do that for sure..

It seems like I may have to be the guy to take one for the team and see how it sounds myself.
just delete the resonator should do the trick. Deleting both 2nd cat and resonator may give you bad drone. Please let us know how it sounds
Will do, I'd like to get some volume out of it for cheap..

hopefully bmw set us up for success with just some deletes.

I'll get some nice underside shots for everyone too once we get it on the lift.
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      04-15-2021, 03:54 PM   #6
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Quote:
Originally Posted by LBbluem2 View Post
But if I can just go down to a exhaust shop and have them cut out the secondary's and the resonator so it's just straight through pipes and get a good sound..
If you like the general tone of the exhaust and just want more volume, then this should work and be fairly cheap
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      04-15-2021, 07:37 PM   #7
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Quote:
Originally Posted by LBbluem2 View Post
hopefully bmw set us up for success with just some deletes.
In addition to my reply above, it's probably helpful if I gave some context. My reference point will be S55 and F8X as that's what I have but it's likely very similar for S58 & G8X. On S55, deleting the secondary cats and resonators does make a pretty noticeable volume difference. One thing that you may not consider when you do this, though, is the way that the valves operate. For example, the valve isn't open ALL the time on sport & sport+; there are certain conditions that the valve will be closed (such as low revs in a high gear) in order to reduce drone. If you do a secondary cat / resonator delete, you may find that when driving even in sport/sport+ that it doesn't sound as loud until you hit higher RPMs - many don't realize this is due to the valves being closed. The solution is to either unplug the valves when open or use a valve controller to force them open all the time - there is a big downside though to the valves being open all the time (especially w/o the secondary cats & resonator) in that it drones like a MF if you're just cruising between 1.5-3k RPMs. The best solution is having a valve controller once they're released for the platform so you can have the valves open when you want the thunder and close them up when you're just trying to cruise.

Again this is all based on my experience with S55 & F8X, however, I do not imagine that the outcomes will be much different, if at all, with S58 & G8X
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      04-16-2021, 01:15 PM   #8
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I'm Stopping by a exhaust shop today to see if they can just get it done for me.
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      04-16-2021, 03:26 PM   #9
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Quote:
Originally Posted by weidake View Post
I'm Stopping by a exhaust shop today to see if they can just get it done for me.
Damn you're beating me too it
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      04-17-2021, 10:52 PM   #10
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Quote:
Originally Posted by LBbluem2 View Post
Quote:
Originally Posted by jonahk View Post
Quote:
Originally Posted by LBbluem2 View Post
Anyone cut out secondary cats or resonators yet?

This thing is way to quiet.

It's making me miss the sound of the s55.
Not affiliated with them in any way, but Valvetronic has a mid pipe in development for the G8x:
Yeah I saw that,

But if I can just go down to a exhaust shop and have them cut out the secondary's and the resonator so it's just straight through pipes and get a good sound..

I'd do that for sure..

It seems like I may have to be the guy to take one for the team and see how it sounds myself.
When you do let us know how it sounds.
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      04-18-2021, 02:58 AM   #11
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Quote:
Originally Posted by weidake View Post
I'm Stopping by a exhaust shop today to see if they can just get it done for me.
Keep us posted, man! Looking forward to hearing back from you.
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      04-20-2021, 04:00 PM   #12
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There are 2 resonators before the muffler. Debating on which one to cut
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      04-20-2021, 04:56 PM   #13
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Quote:
Originally Posted by weidake View Post
There are 2 resonators before the muffler. Debating on which one to cut
I know G8X has different exhaust routing than F97/8, but does it have a similar dual secondary cats into an H-pipe resonator like this?

View post on imgur.com
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      04-20-2021, 11:30 PM   #14
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Quote:
Originally Posted by RugbyBro View Post
Quote:
Originally Posted by weidake View Post
There are 2 resonators before the muffler. Debating on which one to cut
I know G8X has different exhaust routing than F97/8, but does it have a similar dual secondary cats into an H-pipe resonator like this?

View post on imgur.com
I took a screen shot of rk tunes video
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      04-21-2021, 12:49 AM   #15
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Stock catalytic converters!

Hey guys lmk what you guys end up doing ! I might need the stock catalytic converters 👍🏻 pm only thank you !
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      04-21-2021, 10:02 AM   #16
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any updates on the sounds anyone delete anything yet? please keep us updated... this will be one of the first things I will want done when my car gets here... car is way to quiet!

thanks in advance
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      04-21-2021, 04:06 PM   #17
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I'm starting with the 1st resonator and see how she sounds
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      04-21-2021, 05:01 PM   #18
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Wall-e saying hi
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      04-21-2021, 05:14 PM   #19
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Quote:
Originally Posted by weidake View Post
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Can you tell if those are H-pipe resonators by looking inside?
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      04-21-2021, 05:29 PM   #20
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Quote:
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Quote:
Originally Posted by weidake View Post
Wall-e saying hi
Can you tell if those are H-pipe resonators by looking inside?
No h pipe both just go straight through
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      04-21-2021, 05:38 PM   #21
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Quote:
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No h pipe both just go straight through
Oh interesting, the second resonator must be an H pipe then. I'm interested to see how your car sounds with the first removed
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      04-21-2021, 07:28 PM   #22
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Gut of the first resonator
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