[Barry9020]

currently have RPI mufflers on my 550 and im having drone around 1.5-2k rpm. after looking around on the forums some people are saying that replacing the resonator with a x-pipe helps with drone at low RPM's. Does anyone have any a x-pipe set up that can tell me if it will help with the drone issue? thanks and happy new years everybody!

[mikekilpatrick]

Do you still have the vacuum enabled WOT valve on these mufflers? Or do they delete it? I had the SAME issue with a name brand muffler at same speeds and once I switched to Dinan, which uses valve control on two of the muffler exhaust ports, the drone was greatly reduced at low rpms

[Barry9020]

Originally Posted by mikekilpatrick

Do you still have the vacuum enabled WOT valve on these mufflers? Or do they delete it? I had the SAME issue with a name brand muffler at same speeds and once I switched to Dinan, which uses valve control on two of the muffler exhaust ports, the drone was greatly reduced at low rpms

No these mufflers didnt come with vacuum ports. Im hoping to get some insight on the xpipe solution if not im jus going to go ahead and jump the gun and get it done and hope for the best 🙏🏽

[AMT92]

X Pipe will help equalize the airflow so yes, in theory, it will help a TAD. Your best bet is a J Pipe. Lookup "J Pipe Drone" and you'll see its success on many different forums including my own car. You'll need to go to a competent exhaust shop that isn't afraid to do some custom piping.

[AMT92]

Photos of my J Pipes in case your shop needs some visuals

[Barry9020]

Originally Posted by AMTF10

Photos of my J Pipes in case your shop needs some visuals

How much did the j pipes run you? I might just go ahead and install the xpipe and see how it goes. Asides from the drone will the xpipe imrove the exhaust note in anyway? Are there any other benefits of it

[Gpfarrell]

Not to compares bratwurst to cheeseburgers, but when I replaced a damaged H-pipe on my Mustang with a sleek-new X-pipe the drone became almost unbearable. YMMV.

[MattPro]

Originally Posted by Gpfarrell

Not to compares bratwurst to cheeseburgers, but when I replaced a damaged H-pipe on my Mustang with a sleek-new X-pipe the drone became almost unbearable. YMMV.

This. Every engine produces a different exhaust tone, and every exhaust setup is difference. Drone is caused by resonance, so there's not one fix all solution. An x-pipe might work well on one car with a specific exhaust diameter and exhaust noise, but make another car worse. It's really hard to guess and hope on these things.

I think that's part of the reason why exhaust setups for our car are so expensive, because of the engineering that goes behind them.

[Gpfarrell]

That makes sense!

[Barry9020]

Originally Posted by MattPro

This. Every engine produces a different exhaust tone, and every exhaust setup is difference. Drone is caused by resonance, so there's not one fix all solution. An x-pipe might work well on one car with a specific exhaust diameter and exhaust noise, but make another car worse. It's really hard to guess and hope on these things.

I think that's part of the reason why exhaust setups for our car are so expensive, because of the engineering that goes behind them.

Im going next Thursday to get the xpipe installed i remember someone with a 550i with the same mufflers had told me the xpipe helped with drone in his car hopefully it does the same with my car

[NV GUNS]

i am getting bad drone also at the 1.5k to 2k on my cat back M5 CP exhaust. don't know what to do either.

[AmooManiak]

Originally Posted by NV GUNS

i am getting bad drone also at the 1.5k to 2k on my cat back M5 CP exhaust. don't know what to do either.

Did you ever figure out what to do with the drone? I'm getting the drone as well in the same RPM range. I already permanently removed the exhaust valves when I had the tips installed. Would partially closing the outside tip possibly remove some of the drone or would it create a whistle sound? Only other thing I can think of is to retrofit the valves I have left from the 550i...

[AMT92]

Originally Posted by AmooManiak

Did you ever figure out what to do with the drone? I'm getting the drone as well in the same RPM range. I already permanently removed the exhaust valves when I had the tips installed. Would partially closing the outside tip possibly remove some of the drone or would it create a whistle sound? Only other thing I can think of is to retrofit the valves I have left from the 550i...

Wait you have the M5 CP mufflers and you REMOVED the valves instead of hooking it up to your vacuum line?

[Barry9020]

I installed a custom fabbed x pipe last week and it really woke my exhaust up! It has a deeper growl to it now and it helped get rid of drone as well. It has a nice deep exhaust tone in the cabin now instead of that loud exhaust vibration sound that it had before! Will definitely be posting videos soon!

[AmooManiak]

Originally Posted by AMTF10

Wait you have the M5 CP mufflers and you REMOVED the valves instead of hooking it up to your vacuum line?

No, I don't have the CP mufflers. I have regular M5 mufflers and removed the valves as there was no noticeable sound difference with the M5 exhaust.

[AMT92]

Originally Posted by AmooManiak

No, I don't have the CP mufflers. I have a regular M5 exhaust and removed the valves as there was no noticeable sound difference with the M5 exhaust.

If you had connected the vacuum lines the exhaust would have been much louder in the higher RPMs with minimal drone down low

[AmooManiak]

Originally Posted by AMTF10

If you had connected the vacuum lines the exhaust would have been much louder in the higher RPMs with minimal drone down low

I know, it was connected. There wasn't any noticeable sound improvement with the valves closed, which is 90% of the time. That's the reason why they were removed all together.

[The_M6]

I just keep the car in SPORT mode...higher RPMs=No drone!

By manually shifting, I keep the rpms just above 1900 in all gears which eliminates the drone. The engine sounds so much better above 2k rpm anyway

[AmooManiak]

Originally Posted by Blu550

I just keep the car in SPORT mode...higher RPMs=No drone!

By manually shifting, I keep the rpms just above 1900 in all gears which eliminates the drone. The engine sounds so much better above 2k rpm anyway

I noticed that, too. Do you still have the valves or did you remove them? Car sounds great over 2K RPMs with no drone.

[The_M6]

Originally Posted by AmooManiak

I noticed that, too. Do you still have the valves or did you remove them? Car sounds great over 2K RPMs with no drone.

I have a full custom setup now with Magnaflow mufflers. Initially I had the resonators deleted but the drone was unbearable below 3k rpms so I reinstalled them and now have the drone below 1600 or so.

Sport mode is much more fun and car sounds great!

[NV GUNS]

Originally Posted by AmooManiak

Did you ever figure out what to do with the drone? I'm getting the drone as well in the same RPM range. I already permanently removed the exhaust valves when I had the tips installed. Would partially closing the outside tip possibly remove some of the drone or would it create a whistle sound? Only other thing I can think of is to retrofit the valves I have left from the 550i...

I have not figured it out yet, I need to find a spot on muffler shop to help out. The drone getting out of hand. I will do some research into that. Another member suggested Windy city muffler shop. I will have to give them a call and figure this out. Also did you get your idrive tpms fixed? If now I know how to fix it now.

[AmooManiak]

Originally Posted by NV GUNS

I have not figured it out yet, I need to find a spot on muffler shop to help out. The drone getting out of hand. I will do some research into that. Another member suggested Windy city muffler shop. I will have to give them a call and figure this out. Also did you get your idrive tpms fixed? If now I know how to fix it now.

No I didn't. Let me know when you're available! I will be out of town this weekend but will be around next weekend.