Reduce restrictions on your OEM exhaust system with MAK's Off-road Y-Pipe, now available for the 2011-2013 Ford EcoBoost F-150. The Y-Pipe's 3-inch stainless mandrel-bent off-road design eliminates catalytic converters with performance gains of up to 25 hp, and it bolts up to factory or aftermarket exhaust systems. MAK also offers preorders on the Y-Pipe with Magnaflow's Hi-Flow Metallic Spun catalytic converters, which are 49-state legal. MSRP: $390; add $200 for optional catalytic converters.