Twin with hx35
if your doing twins, ht3b, but i wouldnt recomend running the stock hx35, look into an hx40. the stock 12cm exhaust housing is way to restrictive when you start pushing some fuel, your egts will be threw the roof!
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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