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Originally posted by crawlr
I really don't think the motor noise affects the test since they are holding the sensor at a very specific spot 20" behind the pipe.
Interesting. The police in Australia do much the same thing with random tests on street cars. :hammer:
I would suggest that when you get your dB meter, that you experiment with different angles of "turn-down" on the rear cap.
Some of you may think I'm talking out my a$$, but if you get the chance, stand 10 feet behind a Moto or Blaze. You can feel the exhaust pulse and on a cold morning, you can even see the noise. Changing the direction and flow charicteristics will alter acoustics. Just ask Derno.
I am not going to offer any concrete modification tips, just food for thought...