Originally Posted by Kerns

So much misinformation in this thread. A T-Trim will make the same amount of power vs an S-Trim until you get into larger boost levels. Keep in mind boost is a measure of restriction not power. 10psi on a stock heads/cam car will make less horsepower than 10psi on a stage 2 heads/cam car. However, in order to get that same 10psi of resistance you need to increase the amount of CFM that the blower is pushing. A T-Trim becomes more efficient than an S-Trim when you start flowing higher CFM amounts aka more boost. An S-Trim in the lower boost levels is actually just as efficient as a T-Trim. For instance, if you have an S-Trim head unit on a car making 10psi and switch it out for a T-Trim head unit on the same car making the same 10psi you will not gain any power.

T-Trims are a better blower over an S-Trim because of 2 reasons. 1) They can be spun faster and thus create more CFM or boost than an S Trim. and 2) When spun faster they become more efficient than an S Trim and produce less heat so you are able to run more timing.