well i know the teflon wears on the screws or whatever the technical name is for the parts in the charger, which is what my roomate said (big mustang buff, who helped me install the parts. But before i bought the parts i talked to a sales rep for the smaller pulley from south florida pulleys and he said they have dyno tested it and it adds 26 hp without out re-tuning it, he said i could prolly re-tune or add some dumb chip or whatever but the cost wasnt worth it. But the cold air intake i bought from k&n said it increased hp by 12 and of course they also said it was dyno'd and the parts came with a print out, but im not sure if thats all just garbage they say to get you to buy it, but whatever. I know there will be some repairs down the road with the supercharger and the lifespan of it, but the charger, which i looked up on ebay was only $400 brand new so its almost like why not do it. I guess i was just wondering if anyone else has done it and can maybe give me more info on how it went