Earn 100 Manufacturer Points with the indicated company to unlock the corresponding Plug-In:

Auto Rocket Start System: Zolgear
Collision Decreaser: All tire and suspension manufacturers
Down Force Control System: Bosconian
Nitrous Tank 100: All nitrous manufacturers
Over Limit Start System: All engine tune up manufacturers
Prize Money x2: All manufacturers
Race Data Analyzer: Galaxian
SS Booster: Arkbird
SS Canceler: All exterior parts manufacturers