CTS Turbo 4.5" High-Flow Cat for BMW B58 1/2/3/4/5/7 Series RWD & XDrive - All Generations

The CTS Turbo 4.5-inch high-flow catalytic converter addresses the restrictive factory cat on B58-powered BMWs across the 1, 2, 3, 4, 5 and 7 Series lineup. Designed for both rear-wheel drive and XDrive variants spanning all B58 generations, this upgraded cat features larger internal cell density to significantly reduce backpressure while still filtering emissions. The direct bolt-in design integrates seamlessly with stock or aftermarket exhaust components, making it an essential supporting modification for tuned B58 engines demanding improved exhaust flow without sacrificing street legality.