I have just added a nice drawing of a silencer for a J2 to the Documents Download | technical section courtesy of Keith Pilgrim. He states "I believe it will be shared with the P-Type and others. The original silencer for the J was quite short and apparently very noisy. It was then extended to the proportions shown on the drawing. I believe it will be shared with the P Type and others. The original silencer for the J was quite short and apparently very noisy. It was then extended to the proportions shown on the drawing. I believe that the silencer will fit most of the MMM cars although I see that the F type has an oval box".