Quote:
Originally Posted by IB M
Is it mechanical flaps that are actuated to alter the sound output or some JBL speakers wired in to the muffler??
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No flaps with this exhaust.
There is a speaker in that bulbous casing, which is not connected to the actual exhaust pipes. It has its own outlet.
I'd expect no power gains for stock engines, with the exception of the 335d which suffers from increased back pressure.
I'd also expect possible low power gains for tuned cars (includes M-PPK), as the muffler is much smaller and seems not to be a reflector type as stock.