I will second the Thunder Alley! Great power!

Chris

I will be getting a dyno comparison between the Thunder Alley and HPR end cap within the next couple of weeks for Eric. I just got to get the 730 put together. I ment to due it when I first went with the new piston but ran out of time to due the comparison.

My Thunder Alley

DS Thunder Alley with other bikes

 

I have a shot on youtube of my ron wood pipe, hmf pipe, and big gun if youd like to see / hear them all - NWoehrle10 is my name on there

 

When I was building my 650 up I did all of the things my engine builder told me to I was running the yoshamira pipe and no matter what we did it would not go over 51 HP I got the Ron Woods pipe and with proper jetting on the dyno it went rite to 60HP we could not believe it. But my builder told me that for a relatively stock bike that the yoshamira was showing better HP numbers than all of the rest.