It's no secret that two turbos on a diesel engine are significantly better than one, but the problem is getting an extra turbocharger to fit. The six-cylinder Cummins engines have lots of space in the engine bay that makes mounting a second turbo easier, but the V-8 Power Stroke and Duramax engines don't have much extra real estate to park a second turbo on top of the engine. However, Nathan Wright of Maximized Performance has designed a kit for the Duramax that utilizes the stock turbo-even the Garrett variable-geometry turbo (VGT) on the LLY and LBZ engines-in the factory location and mounts a second turbo on the passenger side of the engine compartment. We met up with Brent Willsey and Jeremy Bird at Powerlabs Diesel in Idaho Falls, Idaho, to see how the twin-turbo kit was installed on an '07 LBZ Duramax.
 |  The first step was removing...  The first step was removing the factory air intake. The MPI system will be completely different with the twin-turbo setup, so the AFE pieces won't be reused. |  The factory coolant-overflow...  The factory coolant-overflow bottle was removed to make room for the new turbo. |
 Next, the battery and stock...  Next, the battery and stock battery-mounting plate were removed. |  The intercooler pipe, intake...  The intercooler pipe, intake heater, and EGR pipe were removed. |  Then the downpipe clamp was...  Then the downpipe clamp was removed from the stock turbo, and the downpipe was pulled from underneath the truck. |
 The plastic pipe that mounts...  The plastic pipe that mounts on the intake side of the stock turbocharger was also removed. |  The MPI kit came with a small...  The MPI kit came with a small plate to block the EGR valve, which defeats the EGR emissions system. |  The new MPI intercooler piping...  The new MPI intercooler piping was then bolted on to the stock turbo's inlet. |