Hi i need help


New Member
Hi i need help i have fz600 2005 year with leo vince sbk when i get out the mufler silencer the bike get rought at idle when i put them back the bikes turns to normal what coud cause the problem


2007 FZ6
Site Supporter
As Gary posted, you don't have enough back pressure by removing the CAT too.

Put the CAT back in and it should be fine..

It'll still be plenty loud but not obnoxiously..