I know it's too early to tell and there are not too many comparisons out yet but:

What pipe and headder has the best performance for the YFZ 450?

 

Everybody is pretty high on the Sparks, based on what I've seen I am going to have to get one.

 

here are some more details click me

 

Sparks by far I got 10.5 to 11 hp gain from the pipe and airbox off.

Its a lil loud but a nice pipe.

Mike

 

Did you get headders as well? Did you dyno test before and after? What were the jet settings with the pipe and airbox removal?

The reason I'm asking is that almost every pipe company is claiming 10 to 11 hp gain, so to me means all is equal...what do you think?