Fits: 1999.5-2003 Ford Powerstroke 7.3L
Sinister Diesel 7.3L Powerstroke up pipes eliminate the slip joint in the cast merge piece which is a common location for the factory up-pipes to leak. The Sinister Diesel up pipes are constructed of stainless steel for corrosion resistance and mandrel bent for maximum flow. We have opted to get rid of the bellows in favor of a much stronger, longer lasting "double slip" flex joint. In turn, there are now, no bellows to heat fatigue and crack. It will still allow the upper and lower sections of the Y-Pipes to flex and move due to heat expansion, while maintaining a 100% seal. The double slip also allows some flexibility to account for different tolerances in the motors from year to year, as well as aftermarket turbo kits. All of our up-pipe kits are fully TIG welded on a fixture as well as back-purged for the highest quality and strongest weld possible.
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