i have a 06 yfz450 and its jettd 4 a gytr pipe,air filter, and cdi box. and i was wntin to make it quieter. and dnt feel like re jettin it agin 4 tha stock pipe bc it was rough to jet. i jw how bad it would mess up tha motor if i didnt re jet it. ive had tha cops called one to many times 4 it bein to loud. i was jw how bad it wld mess it up if i didnt re jet it?

 

It will run rich. Why dont you get the quiet core for the GYTR pipe.

 

how much quieter would it be?

 

it should quite it down to about 2-4 or 4-5 decibles. i have a white brothers e-series and i put the e-series quite core insert in and it made it about 4 decibles quiter. it's still loud when you ride it but not as loud as before.