Not much difference @ idle but a big difference at 5K RPM..........
The FMF Q4 is defintely the quietest of the 3........HMF the loudest.

Thanks for the comparison.

 

I like the hmf, it its what I have on my bike. It is quite louder than the fmf. But I like loud I would like another tip for it though, they just look cooler, lol.

 

The vid may be a little misleading. I would say that in person that day the two bros was the loudest. The HMF was loud, but had a lower rumble loud, the two bros is a higher sharper, cracking, loud.
Dan

 

Bump.. still for sale.

 

how much are looking to get for it?

 

PM me a price for the HMF pipe, I'm interested.

 

i have a fmf q4 and have been riding with the fmf q4 for over 5,000 miles now...might be fun to switch to the hmf...i'll update with the sound difference between fmf q4 vs. hmf once it is received...

on another note...after about 4,000 miles on the klx250sf...i don't know if all the engine parts just settled in, but my moto is running quite smooth and quiet...i don't get any vibrations and acceleration is smooth...i was blasting around the freeway at 90 mph at sea level...luckily highway patrol was already giving another person a ticket when i blasted by...when i was riding up the mountain hills, it was barely crawling at about 55 mph to 60 mph....downshift and i was blasting up the hills at 75 mph...100-mile ride at pretty much full throttle...these klx250sf is really bulletproof!...was riding pretty much at full throttle daily, but no sign of wear in the valve or piston...was looking for an excuse to get the 351, but might never happen if the moto just seems to be running better and better....

 

HMF sale pending.
Also, the KLX is an awesome bike. That is all.

 

first, great dealing with matasickle...hmf exhaust was almost brand new...took the fmf q4 off and installed the hmf...took me literally 10 minutes....my fmf q4 has about 5,500+ miles on it now, so it was quite low with a smooth deep rumble...the rattling settles down after a few thousand miles and the exhaust mellows down...

hmf...i think this thing has not been broken in yet (barely used)...it still has a new exhaust rattle to it...at idle and warming up, it's just slightly louder than the fmf q4....when you accelerate...i will have to say that it hurt my ears a little bit...loud deep rattling scream...on freeways....the noise is less noticeable, but you can tell that it is much louder than the fmf q4....50mph, 80mph and 95mph....my klx250sf was running quite smooth and sounding smooth (louder)....if i go from full throttle to none...it'll make a few pops...if i gently bring the throttle down smoothly...no pops...

if i remember, i'll update you with what the hmf sounds like i after it has been broken in....few thousand miles of some black build up inside to get rid of the rattling sound...