Yes, that engine was very conservatively tuned at the factory. Beast of a vehicle, though.The crazy part about that article is they increased the boost to 15 psi and got 620 hp! Which was an increase of 135 hp on stock turbos and relatively low boost compared to what we need to achieve big numbers. That is a prime example that psi doesn't mean beans without cfm. I'd like to see the specs on the OEM turbos.