I've noticed that there's a DB Dawg for the newer style mechanical silencer on the 450F. Would it plug up the bike too much? Any difference to the power output? How much quieter would the already quiet YZF become? I'm looking at possibly getting either an '08 or '09 YZ450F and I do like the idea of slightly de-tuning the bike a little, but I really like the idea of running a quiet bike.