Because of how much variation there is in mods, tire size, 2 vs 4 doors, etc, no one can promise any specific acceleration performance numbers for any performance mod. Prodigy is not promising YOUR jeep will do 0-60 in 4.24s. What Prodigy is doing, though, is testing with a stock 2-door Wrangler, which is a solid baseline configuration of the vehicle. This allows you to compare to reported 0-60 and 1/4 mile results from car websites/magazines (which are also based on stock vehicles).

Stock 2-door Wranglers are reported to do 0-60 in the 6.8-7.2s range, and 1/4 mile around 15.5-15.8s.