Fuel delivery and also just the size of the engine. A large trim T4 compressor housing and matched compressor wheel can push 30lbs of boost into an engine larger than ours. It just has more than enough airflow capacity to satisfy all the air our 2.4 engine can take in. If you had the fuel to go with it, 30lbs of boost would probably blow the pistons through the bottom of the block anyway! They are only gonna hold up to a certain level.
jason
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