I have an "03" 400ex with a 440 big bore and a 11 to 1 JE piston, and a stage 1 web cam, K&N & no lid.
I was wondering what other 440ex riders think on which exhuast would be best overall.
I am considering CT, Yoshimura, LRD, HMF and a Curtis Sparks. Any help would be appreciated.
Currently running White Bros. R4 muffler.

 

i would go with a lrd or a sparks, i run sparks (i dont have the 440 though) and love it

 

for the best power gains, go with the DMC full system, it's a very impressive system. For sound, go with the supertrapp IDS 2 slip on, you can make it as quiet or loud as you want.

 

I Like my HMF but sparks is a very good pipe but ive been wondering about that LTE pipe with the turn down tips ( I hate disc systems)

 

curtis sparks X-6

 

my buddy has an fmf i flo header and he took a stock yz250f silencer and took out the baffles and cut it down to about 7 inchs and its the best sounding and most powerful pipe ive seen.