The sc-trim is capable of making the same hp as the s-trim with a pulley change. It actually has a higher max impeller speed than the s-trim and is more efficient. You can check out the numbers on Vortech's website on the performance matrix. My sc-trim makes 4.5-5psi on a hot day and around 6 on a cool day with the stock pulleys. It is available with the V1 or V2 gearbox. I chose the V1 cause I like the noise. You can check out a video clip of mine at
www.xtrememustangs.com in the video section.