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I'm not trying to eye poke. I trust UP and their results entirely. This kit looks awesome. This will probably be the system I go with. I wouldn't want it to make any more power than it does without beefing up the stock engine, too, so I see what he is trying to explain about going larger.
Here's my guess (if my map represents what they used)....the turbo has plenty of air flow at the PR to hit 10 psi at 4000 RPM where it is very efficient, but should gradually drop to 7-8 psi by 6000 RPM, where it is less efficient and doesn't have the air flow.
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