3.73s are widely reguarded as the best first mod for Mustang GTs. Great for getting your mod motor into it's power band quickly.
You will see a small increase in gas usage, but not much....
A worthy investment in my opinion...
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"The Yellowjacket"
1998 Mustang GT
13.97@103
"Hey, you weren't supposed to be that fast!"- Turbo Eclipse Driver