How to make my thunderbird faster?

I have a 97 ford thunderbird Lx with the 4.6 modular v8 engine. I want to make it a bit faster for fairly cheap. I was thinking about getting a tune and another thing or two. Was thinking maybe and intake or exhaust system. Maybe a cat back exhaust or maybe a high flow cat converter? Any ideas on what would be better or Give me the most bang for my buck? Also if anyone could include links for any of the parts it would be so benificial!

The most fiscally effective power gainer would be a supercharger or turbo setup. Next most effective would be changing the gear ratio in the rear diff.

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