I'd have to go with n16ht5 opinion. Ive read his silencer shoot out thread.he rides enough and would appear he would know how each pipe performs.
I just wouldn't take his opinion on the weight of a WR . He just thinks his WR is a light dirtbike
It's only heavy when you aren't in shape
I just like making fun of people who complain about the weight when they should have bought a YZ250 to get their weekend warrior sideways flat brimmed hat hole shots
I've run the FMF
Q4 and found the spark arrestor was more of an afterthought (quite restrictive). I had to rejet when I ran the spark arrestor. But then I was not legal on USFS land. And the LEXX
with the trail saver is much quieter.