That top mount air-to-air intercooler won’t do what u need it to do, so the PCM will pull timing to prevent detonation when the IATs are high. That means little-to-no additional power unless u add water/meth. Even then, I wouldn't want a cheap turbo upstream of my engine.
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Jezza’s kit is more expensive, but the guy knows what he’s doing (utilizing a water-to-air setup).