Ive seen videos that appear to have a stock can on and its pretty loud and actually sounds good....is the stock can loud though? i know its really restrictive....but my main concern is the sound levels....damn neighbors! thx

 

From what I understand the stock silencer is around 92dB but I'm not sure if that is at idle or at a certain rpm. I have to say that it is pretty quiet for a 660 machine. I think it may actually be quieter than my 350x.

 

Yeah it's very quiet stock. Mine is still stock and it sounds half as loud as my YZ426F, even though I'm sure dB wise they aren't THAT far off.