I need to know what type and brand of approved spark arrested muffler is the quietest replacement for stock exhaust on an '04 YZ250F. I see FMF advertises under 94 dB "on some bikes" and that thing is $350.00+! Miichigan is a 94 dB state, and the quieter the better. If we lose a HP or 2, I don't care. For trail riding, silence rules in my book and I am willing to sacrifice some performance for silence. I am not interested in Ti or headers either, just something simple to bolt on when we trail ride, and my son can moto with the stock exhaust. I don't want a stock WR exhaust with an after market end cap--I run that on mine with a Vortip and it's fine for me--but I think the YZ deserves a bit better and lighter. So, those of you who have actually be sound checked in MI--what do you all suggest?