jedi if yours is a later 16v with the longer airbox then just pull the resonater tube out of the base of the box, it slides out from the front - takes a bit of pulling though to get it out
the noise difference this makes alone is immense, i didnt even have to drill the box or anything
 cheers mate . mine was made november 1989 . do you think that will have it ? i think it is the same k-jet as the1990 onward models.