I have a 2007 400ex and I’m torn on weather to get a hmf performance slip on or a yoshimura rs2 slip on. I did a bunch of research and can’t decide between the two. I need to know which is louder, which is better quality, and which will I get better performance out of. Also what’s the difference in the old yoshi rs3 vs the new rs2. Thanks

 

Both are great pipes that are pretty popular. Personally Ive never heard a Yoshi but ive heard of a couple guys who got a yoshi over their hmf/fmf. Personally I like both FMF and HMF and am running a full FMF rn. They will have very similar power increases but HMF might be a bit louder