Recent independent dyno tests show Sinister Diesel’s stainless steel Y-Pipes for the 2003-2007 6.0L Powerstroke Super Duty/Excursion boost power and performance adding 65hp and 148ftlbs of torque over stock at 2300rpm, thus improving drivability and towing capability. When installed on a vehicle with a performance tune, the increase is even more impressive, adding 121hp and 289ftlbs of torque.
In addition to performance, Sinister Y-Pipes are manufactured for durability. Sinister has replaced the bellows in favor of a stronger, longer lasting “double slip” flex joint which allows the upper and lower sections of the Y-Pipe to flex and move during heat expansion while maintaining a 100% seal. Plus, Sinister Y-Pipes are fully TIG welded on a fixture, as well as back-purged for the strongest weld possible.
The Y-Pipes are produced by Sinister in their Roseville, California facility and are available in raw, ceramic, and heat wrapped finishes.