Question on instaling and jetting wb e series?

They only gave me one t clamp that and the directions say to put it where the stock head pipe and the s bend connect. now where the scilencer and the s bend connect they don't say anything about putting a clamp on there. Are the scilencer and the s bend just susposed to slide togeather? This just did not seem right to me. Also I put the wb e series s bend and a k&n airfilter on my 250ex and it is running fine, doesnt backfire, bog down and I have have not re jetted. Will I notice more power if I re jet?
thanks
joey

[ExVillin400]

i wouldn't even rejet. if its runnin fine with no bog thats a good this. even if you rejeted there would be no power difference. hope that helps.

:) Piece of cake... The sound is awsome and I can tell I have a slight increase. I am adding the kn air filter and rejetting accordingly. Rightnow with the standard jets it runs fine but I want to make sure it is not running lean so I will have to rejett.