Interchangeable lower pulleys.

[L8 APEX]

I added interchangeable lower pulleys to my site. They are within dollars of the old cost on fixed pulleys. I recommend a 4/6# combo for most daily drivers. You can run a 6# all summer then step down to a 4# for winter where air density runs cylinder pressures higher. You can also run up to a 8# ring if you are Unsane:evil . I can get uppers as well though they have their own issues.:tu: I have two 4# kits and a 4/6 combo kit in stock!

http://performanceresearchonline.com/img/interchg%20pulley.jpg (http://performanceresearchonline.com/street/svt/pulley.htm)