’07.5-17 6.7L CUM­MINS

Diesel World - - Buyer's Guide -

MAX HORSEPOWER: 490-520 HP TUN­ING: SMARTY OR EFI LIVE

While lim­ited by a sim­i­larly sized (al­beit vari­able ge­om­e­try) Holset turbo, the 6.7L Cum­mins’s sec­ond-gen­er­a­tion com­mon-rail in­jec­tion sys­tem sup­ports slightly more power with cus­tom tun­ing in the mix. Fit­ted with an up­graded clutch, it’s not un­com­mon for G56-equipped Rams to lay down 520 hp on the rollers—and we’ve even heard of some clear­ing 530 hp. For trucks with au­to­matic trans­mis­sions, marginally lower num­bers can be ex­pected. The trick to keep­ing the fac­tory 68RFE alive at 500 hp rests in good TCM tun­ing.

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