[dantheman]

I have just bought a trx400 and i'm looking for ideas for a pipe and filter
I ride mostly trails and some dune probably 75% trails and 25% dunes.
Reliability is high on my priority list also it needs to be forestry approved.
the supertrapp has removable disc to change the db's does any body use this
pipe

 

[t-rex]

hmf they have different tips to change dbs.hmfracing.com

 

[TRX2fiveO]

HMF, FMF, Curtis Sparks, Yoshimura sounds real nice on a 400EX too ...... UNI, or K&N with outerwears

 

[Billy250X]

Agree.Curtis sparks and hmf makes a real good 400ex pipe.

 

[Redracer]

I use to run a Supertrapp on a dirt bike. Great pipe and great quality. HMF has different tips for different sound levels.