Looking through my new HPD catalog I came across a SC500 dyno in the back.

It shows the SC500 making about 35HP@7000RPM's stock, and 42HP@7000RPM's with their pipe. Although looking at the insert for the pipe it reads "4-4.5HP increase." I'm not a math wiz but 42-35=7? Where's the extra HP coming from? Finally the chart shows the SC500 making nearly 50HP@7250RPM's with "HPD pipe/cam".

Now I did'nt see a SC500 cam listed in the catalog? Whats the scoop here, maybe you guys looking for more performance should look into this. Add the 42mm and Aaen roller (although HPD is selling basically the same thing) you've got yourself a nice thumper.

I dont know if the web catalog has been updated...www.hpd-inc.com