Hi, i´ve just brought my dads 650 dytona, 05 plate with 1500 miles on the clock (bargain of the year for £3000), after owning a 97 cbr 600f for 3 years. He brought a quil exhaust with removable baffle and and ive brought a pipercross foam filter for it however when i take the baffle out the engine doesnt run correctly. Can anyone help? I´d apprecaite any advice so i hope to hear back from someone soon. Cheers, Darren.