Driving the diesel straight after the turbo wasn't as much of a let down as I expected. The turbo definitely had more power than I knew what to do with, but the diesel didn't feel underpowered. It was fine to be honest. I currently drive a BMW 535d I wanted something quicker than that. Of course, the diesel wasn't, but it was a decent car, not as underpowered as I expected. It also helped that they had spec'd the diesels up to look like turbos (21" wheels etc.)