Both blowers you mention are capable of supporting around 550 at the wheels with an intercooler. I recomend you buy a cxracing intercooler instead of the vortech aftercooler setup since its cheaper, is less weight, and has less parts to go break. I actually know of one guy who is making over 600rwhp with the old S-trim overspinning it. Unless you want to make some crazy power I dont see a need to buy a bigger centri IMOP.