has any one heard of a graydon full system for a 400ex if so what are they like,where does it give you the power,here in oz we are limited to the parts we can get for our quads,the other one was a bills pipe slip on muffler at a third of the cost,what jets and k&n filter would i need to run with the graydon system.........thanks

 

i would watch out for the graydon. my buddy ordered one and it came and stuck out past the wheelie bar. the silencer was HUGE. it looked out of place. the pipe looked like the quality was decent though. he ended up sending it back because graydon said it wasn't suppose to stick out past the wheelie bar. he ended up buying a sparks x-4 and loves it. the bills pipes are supposed to be good from what i read. i don't think you should have a problem with either one. for jetting, what is your altitude and temperature you ride in?

 

yea the sparks is a awesome pipe but id go with HMF or maybe LRD

 

yes go with hmf

 

Go with the HMF or Sparks very good pipes i love my HMF but ive cut my HMF to abou 7 inches

 

im running the lrd and its sick , my wifes 400ex is running a powerbomb header and power core4 pipe. its got torq and tons of mid range, the top ends decent with a rev box.