Nothing will add to the look and sound of power to your Focus ST like an exhaust from MBRP. MBRP offers many different series to guarantee you get exhaust at the right price and quality you desire. For over 15 years, MBRP inc. has been producing top quality performance diesel exhaust systems, handcrafted from beginning to end with only the finest raw materials money can buy. Each and every component is built to withstand years of punishment. The Street versions will produce an assertive, richer tone over stock along with a mild boost to performance. The Race versions will provide maximum power gains while delivering an aggressive exhaust note. The Ford Focus has seen gains of 18 hp and 16 ft-lb of torque, and is made in T304 stainless steel, T409 stainless steel, and aluminized steel. the MBRP exhaust system for the Ford Focus ST comes with 4" dual walled T304 stainless steel tips and is 100% bot-on.