I have Evolve Medusa headers and muffler delete and yes there is some drone but I'm not the type to be bothered by it. I actually love the range of noises the combination makes!
On highway speeds you don't really notice unless you accelerate; cruising not so much.
It sounds like the drone would bother you; I would suggest not deleting the mufflers.
I run supersprint headers with no cats or resonators there is some drone but i just turn up the radio i love the loudness of the car when i get on it people always do a double take not expecting that sound from a four door car.
was wondering this same question and I wonder how bad the drone is. People say a muffler delete has slight drone at low revs but I did not hear it on my 540i. I doubt its much different with the m5. I bet headers and a muffler delete would be perfect.
Keeping the resonator will almost certainly eliminate drone. I was running headers to racing cats to SS X-pipe to no resonator to Eisenmann Sports, and while it sounded great, the drone was bad. I then had the X-pipe removed and added the stock resonators, which took care of the drone, but made it substantially quieter. If you run headers to stock cats to stock resonator to muffler delete, I'd bet you'll get the results you'd want.
...but running a tune plus racing cats would be that much better.
I had SS headers with stock cats/resonators and muffler delete. Thing sounded mean but I liked it a lot. Nice deep tone without any rasp. I've never really understood what people define as a "drone" compared to just a loud exhaust but certainly under load on the highway it's noticeable.
I liked it but was getting to the point where I was ready to put my stock mufflers back on.
I can help with that unless you want to know how to write the code. Anyway what I did was open your link. I then found the share button under the video and clicked it. Just under that an embed button appears, click it. A new box opens and has text highlighted in blue, just right click and copy. If you click elsewhere the blue disappears but you can highlight the text again but some will be hidden so pull to the right farther than what you see.
Once you copy the text simply paste it into your thread or post. The last pic is what you see in your posting box.
Slight variation on what you are asking for, but i run headers, sports cats, h pipe and stock mufflers.
So kind of the inverse of a muffler delete...
But it is completely civilized, i can't hear any drone at when on the motorway or when pootling around town. Sounds great when you want it too though
So that could be another option maybe.
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