Which pipe

[400exstud]

HMF sport
HMF Ballance series
White Brothers e-series pro-meg
Yoshimura comp

First of all I don't want to hear "dude look at a different post, there are ten about this." Which one would be the best for HP and torque?

If anyone can find reliable dyno charts post 'em (please pipe with an otherwise stock bike)

Any info. on why the ballance series is better than the sport would be apprieciated.

(sparks pipe is too much $$$)

[crandles]

When mine was stock I had a DMC alien and it ripped.

[robbo1]

yoshi comp made my 300 ex alot torqier...spec in low-mid range

[Ridin' Jesse]

Originally posted by JR3
http://www.260111.s5.com/30961_pipes_WHITE.jpg White Brothers: Installing the White Brothers E-series exhaust system was easy. Here's another one of those mufflers with discs. We went with 13 on this system. The WB setup "sounded" quieter than most of the units we tested. In fact, our test riders voted the White Brothers as one of their favorite systems because of its ease of installation, good packaging, softer sound and consistent power supply.
The dyno run backed up those beliefs. This system, using a 142-sized main jet from Dynojet — produced impressive hp gains everywhere in the power curve. Scores big at peak horsepower and when speeds exceed 40 mph. Easily one of the best, along with the Sparks unit. WB also makes its R4 exhaust silencer and a different version of the E-Series exhaust for the 400EX.

http://www.260111.s5.com/30961_pipes_HMF.jpg HMF Engineering: We just discovered this silencer at the Indianapolis Dealer Expo in February. We weren't able to do a seat-of-the-pants feel, but did dyno it.
We inserted a 148 size Dynojet main jet. (This jet is different than the stock 148 jet. It has a different taper and subsequently creates a different way of measuring, etc.) It produced a nice gain on the bottom end for horsepower and torque. On the top end, the gains were quite small.
hope that helps you a little

[MXRACER86]

I have the YOSHI on my 400ex and It is AWESOME. It has power all the way through and is quality made product! I highly recommend it.

[hondarider2006]

HMF gets my vote. When I had mine it was an awsome pipe, and the power was awsome also:cool:

[400exstud]

I have a ? Ridin' Jesse are you talkin about the pre meg or s-bend.

Also does anyone know if the pro-meg meets the 96db limit?

[Ridin' Jesse]

not exactly sure..thats what he put in my post about exhaust...id go with the promeg either way if you were choosing between the pro and s-bend

[400exstud]

i just want to be legal cause even though i ride on trails in the middle of no where the DNR is still there

[Rebelrider4OOex]

HMF:D

[Pappy]

my bro just got a new white bros e series and that sob is mega loud.

we are our own worst enemies i think

[wheeltrax]

HMF i believe redesigned their pipe, or at least the full system since that test. So it may be a bit different. I just got my HMF a week or so ago, and when i get a chance to ride it, i will post.

[quadkrazy400ex]

i like my yoshi exhaust, seemed to help pretty much through the whole powerband

[red2004 TRX450R]

I would go with a Hetrick Racing Exhaust System.

[sickmojave]

HMF with quiet core. :D

[hondarider2006]

Originally posted by Pappy
my bro just got a new white bros e series and that sob is mega loud.

we are our own worst enemies i think

And the e-series is one of the quieter pipes;)

[muddy400EX]

if you need a quiet pipe then get the e-series s-bend. i had one on my last 400 and it was pretty quiet. im gettin HMF tho:D

[Ridin' Jesse]

umm..the white bros isnt that loud actually...its somewhat quiet compared to alot of pipes like the sparks and tc n such

[400exstud]

Does anyone know or can you find out what the db is for the WB pro-meg full system is. (not sure if the "full system" makes a differnece in the db)

[hondarider2006]

Originally posted by 400exstud
Does anyone know or can you find out what the db is for the WB pro-meg full system is. (not sure if the "full system" makes a differnece in the db)

Its legal in the dunes and stuff where there are db limits, but I couldn't get you an exact db number. I do know that the complete system is quieter than the slip-on;)

[400exstud]

really?

I thought it would be louder. your probably right though.