This model also received Racecraft brand suspension upgrades as well as an aerodynamic body kit installed.

When the New Edge Mustang first appeared in 1999, the horsepower rating increased to 285 (213 kW) due to various engine improvements.

With the introduction of the Fifth-generation Ford Mustang, the designation was now recognized as S281-3V for the use of three valves per cylinder in the engine – now rated at 335 horsepower (250 kW).

The Supercharged version of the S-281 was first introduced as an option for the New Edge Mustang in 1999 with a horsepower rating of 350 (261 kW).

With the introduction of the Fifth-generation Ford Mustang, the supercharger was now installed in an upside-down configuration to provide better performance and a higher horsepower rating of 465 (347 kW).

Key cosmetic differences from the Parnelli Jones Limited Edition include a smaller front air dam, omission of the chrome fascia trim, lack of a hood scoop, the addition of fender badges and a matte-black hood center.

These vehicles were exclusively offered through the Saleen Owners and Enthusiasts Club website and were only available as a Speedster/Convertible configuration.

The most notable external difference on the SA-20's was the introduction of a new 20th Anniversary Cover with an integrated light-bar design, S-281E Spoiler Wing, and center exhaust.