Will cutting off the muffler cut gas milage?

I have an '83 Ford F150, i want to make it ear shatteringly loud, but not wanna mess with the mileage I have. It didn't come with a catalytic converter, and i was planning on cutting off right before the muffler and leaving it. Where i would cut it is about halfway down the truck where cab and box meet. Anyone foresee any problems?

Why not just cut it right after the manifold?

Anyhow, STUPID.

In theory your mileage may change very little. Buy itself. But you will be revving it and trying to go faster so that will kill your mileage.

A 4 stroke engine will run better with less restriction in the exhaust system. I don't think a 1983 truck has any computer system so I doubt you will cause any problems.

You're driving a gas guzzling old pig and you worry about gas mileage? That's rich, I'd be more worried about the tickets you'll get for noise.

Nope, you will get better fuel mileage also