diesal

So, I was looking around at cars and their specs. And I become interested in the diesal powered Jetta's (The 2001 model specifically) And noticed that the GL TDI, the diesal powered one. Had only 90 horsepower, but 155 lb torque. So I'm wondering why is this? I know torque pulls and if 'm not...

already had over 200,00? miles on it. Will it be more expensive in themlong run b/c of cost of parts, etc