Magnacharger
You don't hear or feel the supercharger at idle, But when you touch the gas pedal you know it's there. It puts you back in the seat thats for sure. As for going on a dyno, I'd rather use my motor up driving than on a dyno and don't really care exactly how much horsepower it has. I do know that on a 1/2 ton chevy pickup with the 5.3 it dyno'd out at a 125 hosepower gain.
As for price, Retail is $6995.00. I am a Magnacharger dealer and if you are intersted in one email me and i can give you a better price. Yes i did install it myself but i'm a mechanic for a living. If you work on motors or do much of your own work it is possible you could install it your self. The kit comes complete with very good instruction. It took me 8 hrs so it is a bit of work. :jester