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      07-23-2020, 10:38 AM   #29
CSL335i
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Hungary
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Drives: M2 and...
Join Date: Mar 2010
Location: Budapest/Hungary/Europe

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Quote:
Originally Posted by DriverDaily View Post
I would try to hear the Remus in person.

They are using helmholtz resonators to target specific frequencies and cancel them out. I don't know if they are targeting high frequency rasp, low frequency drone, or both.
That is the point. If OP wants to keep the OPF, than Remus Race is the winner.

With my friend we custom made an axle-back exhaust with two Helmholtz resonator (the same design as Remus Race, but for less money :-)).
We kept OPFs and factory resonators in place as well and integrated the factory exhaust valves as well.
Sounds very-very good and no CELL.

A little bit drone during the cold start up (but only within the first 3 or 4 seconds...)

Akra is an overpriced exhaust axle-back system for M2C with OPF. Not worth it and does not sound significantly better than factory exhaust for that money. On my recent F13 M6 i had Akra, that was a good system with good sound...

Laszlo
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