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Resonator update
Update on the 135 y-resonator:
I'm pretty sure it's not just my ears, but over the 3000 miles it has been installed, my 1M (with Dack's 135 y-resonator) has become considerably less noisy, and the resonances at 2300 and 2800 rpm are now greatly reduced.
When the 135 y-pipe was first installed, I was a bit disappointed that it didn't reduce exhaust noise more, but at this point it is acceptable. To me it sounds like a BMW 6 is supposed to sound - normally muted in driving around town, but developing a nice smooth snarl when wide open.
I don't have a good explanation for this, but I'm pretty sure the change is real. Maybe oil/carbon buildup on the pipes or on the stuffing makes it more effective at soaking up sound? Theories welcome...
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