* Firebird: This was the base model. While you could option a Firebird with performance upgrades, it generally came with less aggressive styling and typically less powerful engine options as standard. Think of it as the more affordable, everyday version.
* Formula: This was a performance-oriented trim level. The Formula always came with a more powerful engine (typically a V8), a sportier suspension tune, and more aggressive styling cues (like a different front fascia, rear spoiler, and often unique wheels). It was designed to offer a more thrilling driving experience out of the box.
In short: A 1995 Firebird could be a relatively basic car, while a 1995 Formula was always a performance-focused version of the same car. You could technically get a Firebird with similar performance to a Formula through options, but the Formula came standard with the better performance package.
