G87 M2 Catback Exhaust System w/ ValvesLAB G87 M2 Catback Valved Exhaust System Unleash a Deeper, More Aggressive Roar Transform your G87 M2s sound with the LAB 3. 5" Full Exhaust System. Experience a deeper, more resonant exhaust note that unlocks the S58 engines full potentialall without cutting into your factory exhaust. Key Features: Deeper, More Aggressive Sound Replace the muted factory exhaust with a thrilling growl that turns heads. Premium 3. 5" Diameter Engineered for maximum