Stone Exhaust BMW N55 Eddy Catalytic Downpipe
Increase horsepower and torque effortlessly with Stone's patented eddy catalytic technology that also adheres to environmental regulations.
Stone Exhaust BMW S63M Cat-Back Valvetronic Exhaust System
Stone Exhaust's OEM-integrated valves can open and close automatically without needing any modifications to stock.
Stone Exhaust Audi EA888 Cat-Back Valvetronic Exhaust System
Produce more power for your 8V S3, coupled with the world renowned Stone signature exhaust sound.
Stone Exhaust BMW N13 Cat-Back Valvetronic Exhaust System
Our award winning Valvetronic System comes with a separate remote controller that opens and closes the valves with a single click.
Stone Exhaust BMW N20 Cat-Back Valvetronic Exhaust System
Via 3D scanning and reverse engineering, Stone engineers have designed a 100% OEM fitment exhaust with precision and elegance.
Stone Exhaust BMW N55 Catless Downpipes
Stone Exhaust's unique flex design and crisscross welding employed prevents breakage caused by extreme heat.