SLP (Street Legal Performance) holds legendary status in the modern muscle car era, specifically renowned for their incredibly close ties to General Motors in the 1990s and 2000s, where they famously built the Camaro SS and Firehawk directly for GM dealerships. Today, SLP continues that legacy by manufacturing premium, 50-state legal performance upgrades for modern Camaros, Mustangs, and GM trucks. SLP is most famous for its incredibly aggressive "Loudmouth" exhaust systems and high-efficiency cold air intakes, providing massive, bolt-on power enhancements with an unmistakable sound.

• The Loudmouth Exhaust: Legendary, resonator-based exhaust systems that deliver a raw, uninhibited, and incredibly aggressive muscle car roar.

• OEM-Level Heritage: Decades of experience developing high-performance, factory-backed vehicles ensures their aftermarket parts fit and function flawlessly.

• 50-State Legal Power: Dedicated to engineering intake and exhaust upgrades that maximize horsepower while remaining completely emissions-compliant.

• Bolt-On Muscle: Direct-replacement parts designed to awaken modern V8 engines with immediate, dyno-proven improvements in throttle response.

Unleash the raw, aggressive sound and legendary power of your modern muscle car with Street Legal Performance upgrades.