5: Chevrolet SS
Released in the 2000s after the Pontiac brand was disbanded, the SS was based on the outgoing Pontiac G8 sport sedan. The styling of the Chevy SS can be construed as one of the most beautiful sedans that GM ever released. The SS was considered a sleeper in many aspects because drivers never expected what was under the hood. But this is actually one of the most powerful sport sedans money can buy (via Motor Trend).
The Corvette derived engine was a major selling feature, although GM discontinued it because consumers are moving away from V8 powered vehicles. Still, if you’re in the market for one of the most unique GM vehicles ever produced, then the Chevrolet SS should be at the top of your list.