Loudest pipe i think for a 400ex would be a White brother e series pro meg. My dad wanted excatly what u want. Its really loud and it also gives you a ton of power!

 

my uncle has DMC and it is almost to loud and it sounds just like u are running opens heads but it also is the best pipe 249 for slip on and 469 for the full

 

cts pipe loud no way man unless its diff from mine big gun is one noisy mfer

 

Soundsw like wheelinforlife Has the small P3^!s Syndrome!!!

 

I have to jump in on this one, loud does not equal power!!!!! This is a proven fact! I have to agree with some of the others here, we have been working hard around here to get public riding areas for the atv's and the biggest problem we run into is the noise. There have been several proposed parks here that have been shutdown before they ever opened because of the noise subject. So if you or anyone else is looking for the loudest pipe, have fun listening to it in your closed garage, you will be helping all the other people out there to get all riding areas shut down and you will have no place to ride!

 

Where i ride there is no law on how quiet the machines have to be. They dont even care if you come with no headers. But i do agree a really loud pipe is crappy when you are the person behind them with no helmet or earplugs.

 

no helmet are you stupid

 

I like pipes on trucks but when it comes to quads don't be a thickhead and go with loud like the other guys said it gets places shut down and makes quads to be looked bad on and that is ruining the other guys who like ridin on trail rides. C-mon have some respect

 

You know, I would almost rather be quiet and fast, than loud and dissapointingly slow. Build a badass motor and have a quiet stock looking type exhaust. It makes the loss even more embarrassing for the people you race.

 

Curtis Sparks All The Way...Except Nothing But The Best Or Lose Like The Rest!!!