While the Garrett GT32 SST turbocharger (left) found on the 2011–2014 6.7L Power Stroke is state-of-the-art and a fascinating piece, it’s notorious for overspeeding when pushed hard. Luckily, aftermarket companies like Maryland Performance Diesel (MPD) offer a sound solution: a budget-friendly, bolt-on system that replaces the problematic turbo with a proven one from BorgWarner (right). When it comes to the Garrett GT32 SST facing off against the BorgWarner S366 SX-E, it’s a classic case of complex and intricate vs. simple and proven. Exotic vs. conventional. Contradictory in nearly every way, the GT32 utilizes variable geometry technology while the S366 SX-E is a fixed geometry design. The GT32 features dual cast 46mm compressor wheels vs. the S366 SX-E’s single 66mm forged milled wheel. A ceramic ball-bearing center cartridge resides in the GT32 whereas a journal bearing center section can be found in the S366 SX-E.