I'm not really expecting any more hp from the underdrive pulley, i just thought it would help with lowering the total recipricating mass by alittle. But you all pose so many good points its still hard to decide what to do. I have another question for you all. I've been told that not having enough back-pressure in your exhaust can make you lose power. Now i have always thought the other way, less back-pressure, more power. I know for a fact that i have 0 back-pressure as you can see in the pic i'm posting, but is there a certain amount i should have? there not in the pic, but i have a pair of Thrush glass-paks about 2/3's the way down the straight pipes.
Anywho thanks again.
P.S. if my pic fails to show, check out my cardomain page.
www.cardomain.com/ride/2488463