G05 X5M Catback Exhaust System w/ ValvesLAB G05 X5M Catback Valved Exhaust System Unleash a Deeper, More Aggressive Roar Transform your G05 X5Ms exhaust note with the LAB 3. 5" Full Exhaust System. Experience a deeper, more resonant tone that brings out the true character of your twin turbo V8, all without modifying your factory exhaust. Key Features: Deeper, More Aggressive Sound Replace the factory exhausts muted tone with a thrilling growl that turns heads. Premium 3. 5" Diameter