Yup - off the line up here where I live (9600 ft) its mighty slow - but once your going the hills dont do too much to slow you down - I just got back from WYO and I couldn't believe the difference! ALSO at lower levals I noticed the engine ran much quieter for some reason - why I dont know, mabe the truck stop fuel did me good!

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1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4