I have a aprila rs 250 . Im looking for a new sound and have thought about removing the packing frm the silencers.Now saying this :- will that modification change the back pressure of the exhaust and if so will i have to shorten the silencer to compensate. Has any body benched flowed a silencer then removed the packing then rebench flowed it ? Or i could just buy new mufflers from b concepts,remove the flanges from the expansion pipe then fitt the new flanges and mig them on then fitt the silencers.The diffenrece being cost .What do you run ?. Is there a BOLT ON after maket silencer for it.Also refering to top end rebuilds is the cheepest price from suzuki or aprila;-if from suzuki am i looking for vj 22 parts or vj23 ?. sorry about the many q's. has any one got a road regod rs250 with aftermarket pipes on it i need to hear your setup .