Nothing wrong with the S-trim, and I'm glad I have it over the KB. I sure it is great in all to have the 'tons' of low-end torque, but it's meaningless if you can't put it down. Plus, Tim can tune the car in a way to give you more timing/fuel down low to create a bit more torque than the factory setting. S and SQ trim have the same housing, difference is that the impeller design is such that the SQ is very quiet in comparison to the s-trim. Personally, I like hearing the blower whine, which is why I went with the S-trim. Unless you are planning on doing a huge build-up (and you really have to be truthful when asking yourself this), then there is no need for more than the S/SQ. There are plenty of guys from MPH running 500+ rwhp using S/SQ's. Like they said above, the worst thing about the vortech line is that the belt is a pain to change. Congrats on the blower though, and you should go to the mph forums and post in Ask Rhonda forum. She'll be able to answer any of your questions within a day or two.