It's all about CFM. I don't know what kind of numbers the JRSC flows, but if it flows less CFM than a T3/T04b/e in a DRAG kit, even if it produces the same manifold pressure of 10psi, the DRAG kit will yield more HP. The Same goes for smaller and larger turbos. A smaller turbo maxed out at 10psi and flowing less CFM will not make as much power as a larger turbo at 10psi that flows more CFM. The larger turbo moves more air at 10psi, and makes more power. Also, at 10psi, the JRSC is getting pretty close to its thermal efficiency limit, which means the air it's pushing into the engine is heated to the point where it starts becoming counter-productive to making power. As for the wear and tear, I don't really know which would be harder on the engine. Since the turbo setup would have a cooler charge, I would figure it'd be a bit easier ont he engine. The JRSC heats the intake charge just before it enters the combustion chamber, which means it's more likely to detonate, so if you're tuning isn't spot-on...