my dg exhaust is pretty nice but its jus way loud. for more top end power i would look into a cam and some port work. for more top speed all u need to do is what everyone has been saying, just change the gearing.

 

thanx man, im planning on putting a k&n air filter and moddifing my air box, then putting a pipe on, ive pretty much got the basics like9nerfs,grips,skids, n a few others. if there is sumthing that would over all add horsepower and help me through the double's...lata man

 

the best exhaust i have used would be the duncan fat boy 4 for the 400 ex it adds like 6 hp and you need to change the cdi cuz it revs a whole lot faster i got a 03 400ex
03 416 ex
12.5.1je piston
white brothers cam
ported head
duncan fat boy 4 exhaust
39mm fcr carburator
hd crank rod
white brothers cdi
ims gas tank
ims foot pegs
ac nerf bars
laegers long travel +1 a arms
roll design +1 1/4 swing arm
prm summit bumper
prm grab bar
maeir 250 r plastic
lone star axe caliber axle
prm skid plates .190 s all the way (belly and swing arm)
elka shocks
elka rear link
itp bead lock wheels
holeshot hd's and xc's depending on pocket size when i get tires lol
roll design anti vibe steering stem and clamps
renthal fat bars
and hell yea i got hand guards lol

 

oh yea
regina chain
sun star sprockets
frame gussets
omf shields
white brothers hd clutch
i think thats all atleast i cant think of any thing else ive done
oh yea if you trail ride the fat boy pipe rocks but your best bet is to drop 2 teeth on the rear sprocket and get a cdi and follow the jetting instructions that they give it works i ran it with just the pipe till the 450s came out and it made a hell of a differance from the e series i had on there prior to it witch gave me a wopping like 2 more hp i barley even noticed lol

 

ya i have a 400ex with a 416 kit and a whitebros full exhaust and i love it the white bros is a great exhaust system if u do go to a 16t front sprocket be really careful because u have to remove the case saver so

 

Why do you think there was such a difference between the two pipes or silencers?