has any one tried these im thinking about getting one but i dont know how much louder they are
exhaust insert

 

Friend ran his 400ex without the stock endcap for a year or so...did a tiny bit for performance and some for the sound...didnt sound to good i thought. Even tho you are opening up the end in these pipes it still has to go through a tiny tiny hole inside the muffler less than an inch and a half wide so its still majorly restricted even with this endcap. For the price it isnt bad but if you are just looking for a bit more performance and a louder tone just remove your stock endcap....