No, the blow off valve wont do anything becauase there is no throttle plate to stop the boost if you let off the throttle. There are a few places marketing diesel blow off vavles but I have yet to see any kind of concrete evidence of it needing to be there.
Its not the wastegate iteself that is restrictive, it is plenty big, its the design of the turbine housing itself. Look at the inlet, 2/3rds of the area of the exhaust housing is diverted towards the waste gate. When the waste gate is closed better than half the exhaust is crashing into that dead area of the housing rather than being diverted to the turbine wheel. If you want to stick with a .36 there are housings available but you will have to change to a stage 1 turbine wheel/shaft.
Just my .02
Jason
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