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Boost isn't necessarily Horsepower. It is how hard the turbo has to force air into the engine. If you use a small t25 or t28 that builds a lot of heat you have to run higher boost to get the same cfm in the engine. If you run a t03/04 you get turbo lag but you can run a more efficient 8-10 lbs of boost and get the same power as 15 lbs from a smaller turbo with lower intake temps. The bottom end isn't the problem it is the piston ring glands that will break first. I made 350whp with stock motor on 15lbs then broke a ring gland. With forged pistons stock bottom end and 20lbs I am making over 400whp.
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