Flowmasters sound real good on 5.0L Mustangs. I have BBK Headers, Off Road H-Pipe with no cats, and Flowmaster AT Cat-Back, and it gives a nice deep rumble at idle, and sets car alarms off when I floor it!
What mods do you have done to your car. 3.73 gears are usually a good balance between gas mileage and off the line power for most cars.
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