[skidoo800x]

i took my stock can off and modified it with a pro circuit dirt bike silencer. Now it runs real bad, do i need back presure or what? []

 

[AHood]

the stinger pipe of that silencer is likely far too small for a 440 CC engine with a single pipe.

 

[BraaPatap]

try putting this in the arctic cat forum. Maybe it will help

 

[catkiller]

ya u deffently need some back pressure.i suggest just getting a name brand can for ur sled.but if u r really determanded to do this i would put some baffels in it or weld a washer over the end.but likee i sed befor i would just buy one and not take the chance of ruin ur motor.