Alright nobody really responded the first time so here i go again, i want to know what the best pipe for my YFZ450 is. I want the best dont care about price........only catch is i dont want a really loud one which is a problem with good exhausts,

 

I'm going to tell you what everyone else will say, which is probably why no one responded, particularly since the YFZ has been so popular.

Search the forums and you will find lots of responses.

You can also search magazines, I know Dirt Wheels did a shootout with 12 or so pipes a while back.

My personal opinion, based on what I've seen and ridden, the Curtis Sparks and Yosh pipes are the best.