[23109VC]

I did the resonator delete on my 2018 M550.

At idle..it sounds great. Very deep and throaty.

the only issue i have noticed is that while driving - at heavy load / mostly full throttle, at about 2500-3000 rpm, the car makes this annoying noise that sounds to me like something is vibrating…as soon as I pass 3k rpm it’s gone.

It’s not a droning noise… but i am starting to wonder if this is some of the resonation that BMW tuned OUT of the system with the resonators?

Does anyone get a noise like this between 2000-3000 rpm? It only happens under load..if I am in park and just revving up - it sounds GREAT… not a touch of this noise I am describing. It only happens when the car is under load / in gear ‘ actually driving. It usually will not occur at partial throttle, you need to be on the gas fairly hard at LOW rpm, passing between 2000/2500-3000. And you REALLY hear it. Almost to me like a farting noise…. It does not sound good.

maybe it’s something vibrating..

I an try to get a sound clip if no one has any clue what I am talking about.

[Lancelot]

Xpipe or straight pipe?
I had straight pipe first but changed to x pipe as the noise was bad at 3-3.5K rpm

[23109VC]

I just had a muffler shop put in straight pipes that replaced the OEM resonators..but they do not appear to be pipes..meaning each pipe is totally separate from each other.

It sounds GREAT 90% of the time..but right at 3k rpm is makes this almost farting noise that is super obnoxious..

Woudl this be remedied by putting in an X pipe? I could buy the Dinan one but it’s $$. Can a muffler shop just modify what I have and hav ethe pipes meet in the middle and merge??

Did changing to the Xpipe get rid of that sound? I assume you had the same sound… and know what I”m talking about?

What kind of X pipe did you do? Prefab one like Dinan or did you just have it homemade?

[choppedliver]

I went straight to x-pipe. Res delete and x-pipe (stainless) was $200USD. It’s a pipe no need for a fancy brand.

[23109VC]

I had my resonator delete done and the shop did NOT do an X pipe. That was the problem. I went back and had them add the X pipe in the middle and it took away the nasty farting sound at 3k. it did get quieter and less loud..but sounds similar. Overall much better.

[jagyro]

just wanna say this. But man I envy yall. I'm trying to find a way to bring this up to my wife without having my *cough* ripped off. lol

[choppedliver]

Originally Posted by jagyro

just wanna say this. But man I envy yall. I'm trying to find a way to bring this up to my wife without having my *cough* ripped off. lol

Just do it, but don't use sports mode with her in the car. She will never know.