Twin with hx35
#2
#6
I've seen suggestions that if you use the HX or HY35 that you should port the wastegate hole below the flapper to a larger orifice. I would think drilling the divider out to balance cylinder drive pressures when the gate opens would be a good idea also. I don't know much about tuning a set of twins, but I've seen where lowering the wastegate opening pressure or at least keeping the stock charger load low is ideal.
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