I've got an Allen kit on my car and I like it a lot. $6,500 installed for an intercooled Positive Displacement Supercharger is a really good price. You’ll pay nearly that much for a Kenne Bell, Saleen or Roush without the install fee. Yes, some blowers will make more power, but the drivability with this kit is excellent. And yes, the Centrifugals are cheaper which makes them quite attractive, but on a street car running the stock bottom end, they don't make anywhere near the torque throughout the power band, which really bodes well for the Positive Displacement car. My car runs low-13's to high-12's at the track at over 4,200lbs (with driver) with a conservative tune making 343rwhp/389lbs ft/tq running through an automatic transmission and independent rear end. And I've got the REV I kit. Your '01 will be utilizing the REV II manifold, which is better still. Expect to put out about 370RWHP and like amounts of torque with the 9psi kit, which is pretty much on par with any of the other entry levels kits.
Here are a couple of video’s of my car at the track and on the dyno. The blower whine at full throttle alone is more than enough reason to by one.
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Pay no attention to my transmission issues going down the track. I've since had the problem fixed.