I have a friend in southern N.M. with 2 86 Turbo troopers. Fantastic fuel economy. they both have over 250K without overhauls. They both have a hard time getting up and going. Even in low range 1st gear hill climing 4wheeling is not very much fun. 5th gear with the A/C in a new mexico wind makes the turbo work hard and fuel economy go down. way underpowered compared to the 4 cyl gas versions I owned for over 10 years. I do not think that engine has enough power for the VX- unless you ride around in LOW range all the time. Just my guess! The stock VX is at times underpowered some would say. SO go for as much power as u can. remember , Santa Fe is HI altitude. get it right the first time!