’01-04 LB7

Diesel World - - Buyer's Guide -

MAX HORSEPOWER: 460-500 HP TUN­ING: EFI LIVE

Thanks to its abil­ity to ac­cess and al­ter vir­tu­ally ev­ery pa­ram­e­ter in the ECM, EFI Live was noth­ing short of rev­o­lu­tion­ary when it de­buted in the Du­ra­max seg­ment. Once af­ter­mar­ket cal­i­bra­tors had mas­tered the soft­ware, 6.6L-pow­ered GMS were more pow­er­ful, ef­fi­cient and drive­able than they’d ever been. More than a decade later, it’s still the tun­ing method of choice for truck pullers, drag rac­ers and daily driv­ers alike. Tak­ing ad­van­tage of all that EFI Live has to of­fer, many tuners can push an LB7 to the 500hp mark, espe­cially in a ZF-6 truck with a clutch up­grade. As for the stock Al­li­son, it’s on thin ice at this power level, which is why most tuners draw the line be­tween 425 and 450 hp.

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