I cannot speak for the 35FP however I can for the 35AX and it is a superb engine and it will accept the same quarter wave Ultra Thrust pipe that the 25FX uses. The problem is I noticed that Ultra thrust do not seem to be avalible at Performance speciailties anymore and this I was affraid of since Henry Nelson closed his doors. Lets us hope there will be secret stash of castings somewhere for Mr. Shadell to discover.

Anyway I am sure Dub Jett can supply his quarter waves to fit the small OS's.

John