Which exhaust system is best for a 2001 400ex? It needs to be quiet though. It can only be alittle louder then the stock pipe if possible. Anyone know which pipe is good? I have a wright brothers full exhaust system that im trying to sell. I would use that, but its just too loud.

 

The Duncan Fat Boy Four Power exhaust is the exhaust that makes the most power for the 400ex. It is however very loud. I run a White Brothers E-Series complete system with 12 disks in it on my ex. If you want to go quiter, your not going to have very much performance gains. Check out this web site. It will also give you some information. Good luck!



http://www.ctracing.com/PD_ct%20phot...ch2001_pg4.jpg

 

hmm ok thanks. If i get just like a 4 Decible gain i will be happy. I will see if i can find something.

 

in dirtwheels it says that whitebros has most hp gain


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99 440ex
84 250r
few mods