I wasn't looking for more horsepower (directly). I put the exhaust on it so I could hear the bike. I like to watch the road when I ride and hearing the exhaust allows me to shift the bike better. I didn't want an excessively loud bike and have been happy with StainTune exhausts on previous BMWs. It works as expected and I like it.
I didn't notice any substantial improvement in HP or Torque. The 5000 rpm dip is there with the stock system also. I liken it to a turbo - get it up above 5K and it takes off. As an extra benefit, the StainTune is much lighter than the stock system.
Blue KTM Forum now!!!
'09 Husaberg FE570
'05 BMW R1200GS