New guy from Las Vegas

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i have no personal experience with mach 1s, but from searching various forums many a enthusiast prefer the jlt rai > jlt cai. but jlt is definitely the way to go. they provide the most rwhp in most cases, as would be the case with your lightly modded mach 1. and don't waste your time with 3.73s in a 4v. 4.10s+ is the way to go, your car likes high rpm, and that's what a numerically higher gears like to do, spin to high rpm quicker.

you'll also need headers to complete the exhaust, longtubes for more power.