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This thread is still relevant, though old.
Did the setup stay free of CE codes long term?
What's the pipe diameter into and out of the muffler?
Why not run a 3" pipe outlet instead of two separate pipes?
Any reason not to do this to an M? It certainly doesn't need two mufflers back there.
Asking because I just bought an MZ4 and want to drop the boat anchor exhaust before doing other tuning.
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