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What are the two tubes that connecting to top of catalytic converter on your 1989 Ford F-250 7.5L?

On a 1989 Ford F-250 with a 7.5L engine (likely a 460 cubic inch V8), the two tubes connecting to the top of the catalytic converter are:

1. The exhaust pipe from the engine: This is the larger diameter pipe carrying the exhaust gases from the engine's exhaust manifolds to the catalytic converter.

2. The exhaust pipe leading to the muffler (and eventually the tailpipe): This is the pipe that carries the exhaust gases *from* the catalytic converter to the muffler for further noise reduction. It might be the same diameter or slightly smaller than the inlet pipe.

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