After 1st and 2nd gear any extra low down torque diesels might offer dont mean anything. Peak hp rules, just take a look at the rev range that is being used in all out acceleration. After hitting the rev limiter in 2nd and going into 3rd, high low are the revs gonna drop? 4.5-5t? Not exactly peak torque terratory. If the car has more hp on the dyno but suffer on the road, it most likely has inadequate cooling. Anyway, happy new year and let our engine's live long and happy lives :)