The Akrapovic Slip-On SP series system looks great on the BMW, and improves the performance of the engine. The system is designed as a base-level exhaust system modification. Racing and Evolution complete exhaust systems are also available. The Street Legal version includes an approved noise damper.
    
Performance

Measurements of the Akrapovic SLIP-ON SP series system on the BMW F 800 ST (without noise damper):

Power & Torque: even as a base-level component, the Akrapovic Slip-On SP series system delivers a performance increase. The largest effect is shown on the torque curve, while the power curve is also increased, especially in the middle and at the top of the rpm range. Max. power was 88.4 HP at 8500 rpm, and max. increased power was 2.6 HP at 4000 rpm.