In 1998, it had the same brakes, so the results must be a variation in the test. Power should be about the same in the top end, and the V6 has more low end power accross a broader range of RPMs. I believe the loss of trunk capacity may be due to moving the rear seats back slightly giving the vehicle more rear passenger room than the 97.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record