Talking about street racing is not allowed on the forum as it is highly illegal and dangerous.
When he asks about trans... are you manual or auto. And either way get the 4.10s. The auto needs 4.10s and if you are a stick you have an 04 so you have the deep .62 overdrive and will do fine on the highway.
Google "RPM calculator" and input your tire size, final OD and desired gear ratio and see what you'll be turning on the highway. Stock tire size is 25.7", overdrive for the 02-04 manuals is .62 and .70 for the auto.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.