I'm doing the Nyroc muffler mod. and I'm also going to drill some holes in the airbox lid. What after-market air filter do you recommend? What jetting do you recommend for aggressive trail riding and pulling with these modifications? My elevation is approx. 1,500 feet.

 

Your jetting depends alot on how many holes you are going to put in your air box lid. I run a K&N filter with 9 one inch holes in the lid and I have also removed the part of the airbox that is between the intake snorkle and the filter. I also run a HMF exhaust and have a dynajet kit installed. With my mods the way they are I run the stock pilots, the needles on the 3'rd notch and use 160 & 165 mains. I am a little rich on pump gas but when I mix it with the ultimate 4 it is spot on.