White Brothers false advertisement

[oli700]

I found a brand new WB Pro Meg full system for my sons 400 at what I thought was a good deal at $390. They claimed it made 6 more HP than stock. It arrived today and I fished out the Dyno sheet and sure enough it makes 6 more HP.......with a 10:1 piston, and rev box. Well we dont have that stuff, all we have is a K&N and outerwear. So I cant use the jetting specs WB sent (168 main). We have a 158 and a 160. This is a 2003 and we will be diching the air box lid. 2000 to 3500 ft. in elev. I talked to a guy who has run a 400ex for many years and he says a 155 for a slip on and K&N. It allso says 12 disks is best but again that was for the bike with the piston and rev box.

Anyone out there have any knowledge or insight on this?

[coryatver]

I would try a 160 with 12 disks and k&n and no lid

[bigbearkid4x4]

where did u find a pro meg full system for 390?

[oli700]

Dennis Kirk part #44-8865. I think when I orderd it they had only one on hand. I could not pass it up. I was only going to get a slip on. I will try the 160 this weekend.

Probably not but I grew up on 2 strokes and the 400 is new to us but.....Do I need to move the needle ?