nfox, I don't know if this applies to you or not, however; I recently installed a Stage 2 kit from HiTech Turbo on my HX35. This kit consists of a HX40 compressor housing and a 8 blade 60 cm. HX40 compressor wheel.
I also installed the stock HX35 silencer ring and snapring in the new compressor housing, this allowed me to install the TAG unit with no mods to the new housing.
You've likely already checked this out, just wondering (based on the housing I installed ) if your housing is already machined for the snap ring, allowing the stock HX35 silencer to work.