Diesel World - - Contents - AFE POWER 844.876.9929 afe­ HSP DIESEL 586.785.3110

If you’re an avid reader of Diesel World mag­a­zine, this truck should be pretty fa­mil­iar as we en­ter Part 8 in the build on this 2012 2500HD LML Duramax. Pur­chased used in Novem­ber of 2017 with 117,000 miles on the clock, this ba­si­cally bone-stock truck that had no idea what it was in for. GM en­gi­neers did a great job with the 2011-2014 trucks and the LML pow­er­plant is a solid per­former, with more than 370 hp in stock form. They’ll do just about any­thing the av­er­age truck owner could ask, but let’s be hon­est—we aren’t av­er­age truck own­ers.

We’ve upped the power a lit­tle (an ex­tra 127 hp/217 lb-ft to be ex­act) with the help of the Jam­mer Stage 2 kit from Edge Prod­ucts. We’ve im­proved air­flow through the en­gine with a high-flow in­ter­cooler pipe from De­viant Race Parts, and we ex­tended our range between fill-ups with a 57-gal­lon re­place­ment fuel tank from Ti­tan Tanks. The sus­pen­sion has been up­graded with Bil­stein shocks and a lev­el­ing kit from Kryp­tonite Prod­ucts. To bet­ter fit our needs for heavy tow­ing in the sum­mer, a Curt Dou­ble Ez-lock goose­neck hitch and some air­less rear sus­pen­sion bags from Su­per­springs were in­stalled. Mickey Thomp­son Baja ATZ P3 tires and 20-inch SD-5 wheels of­fer an ag­gres­sive look with great on/ off-road per­for­mance. With plans of adding more horse­power and torque soon with a big­ger in­jec­tion pump and tur­bocharger, this month we’ll be giv­ing the rear end a lit­tle at­ten­tion to en­sure it can han­dle and put that power to the pave­ment safely.

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