Quote:
Originally Posted by CyberDude
It looks like the two inner exhaust ports each have a vacuum actuator that opens up the exhaust port at a certain rpm. My brother’s Z06 Corvette has a dual mode exhaust that opens up at about 3500 rpms causing less back pressure and most of all has an excellent exhaust sound. Is BMW experimenting with a dual mode exhaust system?
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Yep my RS4 has this also, we took the vacuum tube off and taped it up, sounds great and gives 10NM at the bottom end, it improves the drive as well.