pipe questions

[brad_400ex]

i have yoshimura full system right now on my 400ex. i saw LDR, BigGun and Graydon and i was wondering which is the best for my 400ex with the mods in my signature. thanks

[Fluid400]

there was an article in dirt wheels a couple of months ago where they tested all the pipes and more. All were pretty much about the same with the most noticalbe difference was the weight.