i just ordered a white brothers slip-on for my friend's 250ex.how much increase should we notice.it already has a k&n and is jetted

 

I bought the E-series for my 250ex and i noticed that it had a little more torque but I think I got more horspower than anything. I have a white brothers powerfilter in there but i havn't played with the jetting. I wouldn't go back to stock. Since yours is jetted you would probaly noticed a pretty big change.

 

I've got the E-series on my daughters 250EX. I cant really say how much more power it added but the sound is awesome. Not loud enough to tick off the neighbors but sounds like a indy car. It sure looks great and sounds even better. Now if I could just find someone who needs a stock 250ex exhaust.

 

exactly how many db's is the white brothers for the 250? I need it to be under 96. If it helps, does anyone know if the white brothers on the 250 is quieter than the white brothers on the 400? I need it to be legal on the trails.

 

You change how loud the exhaust is by adding or taking out disks. By taking out disks, you will make it quiet. It has a spark arrestor in it so it is legal for the trails.