SLIP-ON MEGAPHONE TWIN EXHAUST SYSTEM (OPEN) for the SUZUKI GSX-R 1000 (2009)  Our sporty and extremely lightweight slip-on megaphones offer a great balance between price and performance and represent the first step in the exhaust system tuning process. The change will be also visual as titanium mufflers add pure GP look to GSX-R. Megaphones are not street legal.      Performance   Measurements of the Akrapovic SLIP-ON MEGAPHONE system on the SUZUKI GSX-R1000 (without muffler insert):  Power & Torque: the exhaust system modification with the SLIP-ON system results in a major boost in performance, delivering a massive 170.6 HP at 11770 rpm on back wheel. But the increased power isn?t available just at the top of the range; the system shows its quality already from 5000 rpm up through entire rpm range. Max. increased power between the Akrapovic and the stock system is 4.3 HP at 6190 rpm. Besides this, the torque is substantially higher in a lower rpm area at 3000 rpm and from middle to high rpm area.