There should be a large number cast into the turbine housing, 12, 14, 18, 21 etc, denotes the size of the housing, I haven't seen a map of an HX35 yet, but I've been told the 21 cm housing is comperable to a 1.08 AR. Works for me, I just block off half the scroll with a 1/8" plate and let it spool faaaaaaaast!

I run a turbonetics evolution on my HX35, 2.3L and has no boost creep at a relatively low 14lbs (ie you need a bigger gate the lower boost levels you run because the gate will be venting more gas).

You can wire the internal gate shut with stainless wire. A friend of mine ran 40lbs with the flapper shut that way. Although if your never going to use it again you could weld it.

I would look for a non-internal gated housing myself. V-bands>bolt on housings IMO.