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Since this is in the nitrous section, if you are spraying the car pretty heavily, the cat has likely melted and is effectively acting like the bananas that Eddie Murphy used in that old LTD in the original Beverly Hills Cop movie.
Unbolt the downpipe from the manifold, and take it for a drive and see if the power returns. Failing that, you can do an exhaust backpressure test or watch the engine vaccuum to determine weather or not the exhaust is restricted.
94 BBB Clone - when it grows up, it's going to be a racecar.
08 F-350 Super Duty 4x4 6.4 Diesel (26MPG)
Ford Diesel Certified Technician