He actually has a strong personal vendetta against yoshimura and he drawn a strange idolistic respect for it...
600rr.net has developed an uncanny loathing and disdain for yoshimura almost soley based on the opinion of "birdman".
Oh your yoshimura question... I wouldn't try to buy a used yoshimura full system. I just really dont think you would be very impressed by what you spent your money on. However, I honestly cant say either what would be a reasonable price for a full yosh system. I dont see how you could spend more than $500 for such a thing.