Great White

A Fourth-Gen MegaCab Ram Cummins Packing a 48RE, an S475, and 1,000 HP

No, it’s not just another Cali-lean Cummins on ‘Forces. Paul Szczypta’s ’12 Mega Cab runs as good as it looks thanks to a 48RE swap, state-of-art fueling, an S475, and spot-on tuning. On the dyno, it’s a proven four-digit performer. On the street, it’s extremely drivable. “I don’t drive it to work every day, but I could,” he tells us. “It doesn’t smoke and it’s not inconvenient to drive. In fact it drives smoother than most people think.” Of course, the right amount of throttle position can set the all season’s ablaze in a hurry—but with 1,775 lb-ft of torque on tap that comes with the territory.

Completely Sealed

Now for the fun part: the 63,000-mile 6.7L Cummins’ bottom-end is all original. On top of that (no pun intended), the head has never even been pulled. To be sure, the engine has head studs, but each ARP Custom Age 625+ fastener was threaded into the block one at a time. That process was repeated for the valve springs, a set of 103-lb springs from Hamilton Cams getting the nod. Hamilton’s extreme duty pushrods conclude the short list of internal engine mods Paul’s barely-broken-in Cummins has been treated to. Operationally, a coolant bypass system from Fleece maintains coolant temp across all six cylinders.

Stainless 2G Swap and S475

When Paul’s plans for his Mega Cab first took a turn toward serious, he ran a second-gen turbo swap and an S472 from Stainless Diesel. After that, he installed an S366 over S480 compound arrangement and watched the boost gauge tap 90-psi for a while. Currently, he’s gone back to a second-gen single turbo configuration, which revolves around the use of a Stainless S475/87/1.00. The truck’s tuning and transmission have been matched to the big 5-blade charger for optimum high-rpm performance and low-end drivability. A Mega intake manifold from Pusher and a Steed Speed exhaust manifold sum up the rest of the engine’s airflow and exhaust mods.

Dual Pumps, 200-Percent Injectors

A big part of Paul’s 1,000hp recipe lies in his injector and pump choices. The fully balanced and calibrated set of injectors were built at S&S Diesel Motorsport, complete with internal body mods and 200-percent over nozzles. Adequate rail pressure is maintained thanks to a dual CP3 kit from Fleece Performance. One of Fleece’s 10mm stroker pumps sits in the factory position while a stock 6.7L Cummins CP3 gets belt-driven up top. The injection system receives plenty of support thanks to a 165-gph FASS system, which supplies the CP3’s with 13-15 psi worth of fuel at all times.

For a turbocharger that allows for both superb drivability and four-digit horsepower, Paul runs an S475 from Stainless Diesel. A 75mm inducer, 5-blade billet compressor wheel and a 5.00-inch inlet bell highlight the intake side, while an 87mm turbine wheel dwells inside a 1.00 A/R exhaust housing with a T4 turbine inlet flange on the opposite side. The 5-blade charger bolts to a Steed Speed exhaust manifold and makes 55-58 psi of boost at full steam ahead.
With a second-gen turbo swap, an S475, and a billet-aluminum valve cover, it would be easy to assume the 6.7L Cummins in Paul Szczypta’s 1,000-rwhp ’12 Ram is packing aftermarket rods, pistons, and head work. However, the complete opposite is true. The factory, 63,000-mile bottom end is completely untouched and the head, while lightly modified, has never been off of the block. Hamilton Cams’ 103-lb valve springs (along with its Extreme Duty pushrods) and ARP Custom Age 625+ head studs (installed one at a time) complete the head’s short list of upgrades. To keep the rearmost cylinders from seeing too much heat, a Fleece Performance Engineering coolant bypass system was installed.

48RE Swap

With an original goal of 750 to 800 hp, Paul took a chance and kept the G56 manual in the mix, in the beginning. Thanks to some sensible driving, it lasted four years before fourth gear shattered under full power. Then, instead of gambling on a second gear box , he enlisted the help of Wilson Patterson Diesel, who spearheaded a 48RE swap. To make sure Paul’s power goals were achieved and the automatic survived in this 8,100-pound application, WP Diesel fitted the 48RE with Sun Coast’s billet, 27-spline input shaft. A TCS 300 Maraging steel intermediate and 29-spline billet-steel output shaft also made the cut, while a Sun Coast triple-disc converter, spec’d with a 2,200-rpm stall speed, handles power transfer. Sun Coast’s plug-and-play E618 valve body, tuned through the use of a PCS 2800 stand-alone controller, controls its shifts.

Piling plenty of fuel on top of his factory bottom-end, Paul’s Cummins sports 200-percent over injectors and dual CP3’s. The injectors were built by S&S Diesel Motorsport and received internal body modifications, while a dual pump kit from Fleece integrates the CP3’s. One of Fleece’s PowerFlo 750’s sits in the factory location (a 10mm stroker pump) and a factory 6.7L Cummins CP3 gets belt-driven up top. The healthy injection system is tamed via EFI Live ECM tuning.
A Mega intake manifold from Pusher Intakes routes compressed air into the head through dual, 3-inch diameter mandrel bent tubes. In addition to offering one of the most unique looks in the extensive world of aftermarket Cummins intake manifolds, this design is said to nearly double the flow of the factory unit.

A Tire-Frying Daily

So what does it all amount to? How about a truck that makes a dyno-proven 1,013 hp and is a hell of a lot of fun on the street. Yet even at this power level—and on a stock bottom end, no less—Paul doesn’t bat an eye about taking the truck on out of state road trips. Thanks to his carefully selected turbo, tuning, fuel, and transmission combination, the big Mega Cab is just about as reliable, well-mannered, and refined as 1,000hp gets. Of course, when it’s time for his 21-foot limo to run down the occasional Corvette or light up the rear tires at highway speeds, Paul is more than happy to do it.

The CP3’s get their fuel supply from a 165-gph Titanium Signature series FASS system that’s tucked up along the driver side frame rail. A steady, 13-psi is maintained to the CP3’s, as well as ample volume thanks to the system’s ½-inch fuel lines. An auxiliary fuel filter line kit from Fleece allowed Paul to remove the factory fuel filter from the equation.
After shelling the original G56, Paul contacted Wilson Patterson Diesel about performing a 48RE swap. The folks there set him up with a competition-ready version of the popular Chrysler four-speed that’s chock full of some of the best components Sun Coast, TCS Products, and PCS have to offer. A 2,200-rpm stall, triple-disc Sun Coast converter sits on one of the company’s 27-spline billet input shafts, while a TCS 300 Maraging steel intermediate shaft and 29-spline billet-steel output shaft are also employed. The icing on the cake is Sun Coast’s E618 valvebody that takes its electronic cues from a PCS 2800 stand-alone transmission controller.
Part Illusion Purple, part polished aluminum, the American Force 24×12 Fallout FP’s on Paul’s fourth-gen definitely stand out. They’re fitted with 305/35R24 Ohtsu ST5000 all season tires, tires that—in addition to offering solid performance on dry and wet surfaces—Paul says hold up pretty well to the occasional burnout.
Being that Paul’s Mega Cab left the factory with a G56, the hole in the floor was put to good use during the 48RE swap. Wilson Patterson Diesel built the one-off mount for the TCI Outlaw shifter, and the shift boot topped off its seamless integration of the four-speed automatic.


The customized projector retrofit headlights are a product of RetroShop, as are the truck’s LED fog lights. As for the late-model grille, Paul was able to change the face of his ’12 by scoring it off of a ’17 Laramie Sport.
Despite the coil springs being powder coated white and aside from the addition of Bilstein 5100 series shocks, the front suspension is completely stock. However, the rear suspension was lowered by removing the factory blocks and installing a 2-inch drop shackle kit. Once the desirable Cali-lean look was achieved, a set of Flight Fabrication’s ladder bars (complete with LED-lit logo plates) were added to control rear axle wrap.
To get the exact look he was after, Paul added a third-gen tailpipe to the truck’s 5-inch exhaust system. Further upstream, and in an effort to get the exact sound he was after, a Turbine muffler from Aero Exhaust was installed to cut down on cab drone while at the same time deepening the 6.7L’s tone.

You May Also Like
hp Puller

2,700 HP Worth Of Sled-Smashing Fury

Without a doubt, sled pulling is the most advanced form of diesel motorsports. It commands the intersection between the industry’s latest technological innovations and its […]

Blazing Lights: A 3500 Dually Called Plexus

What’s in a name? Well, a rose by any other name would still smell as sweet, as Bill Shakespeare famously observed. On the other hand, […]


A Duramax-Powered Luxury Tank Built for Any Terrain Thousands of off-road enthusiasts hit the desert, the trail or head up the mountain every day, but […]