Lots of mixed opinion on these. The nitrous injection definitely works, if you say otherwise then I have to call you a bonehead... As to the question if it destroys engines prematurely? Well no one knows for sure because no one has bothered to test it in a reasonably controlled environment and give the public results. Now to the supercharger, most people say there is no benefit but from what I have seen it looks like it smooths out the powerband but I'm not sure about added power. In the end though, it is NOT worth the money for both systems whether they work or not. I'd rather buy an extra engine for that kind of money to be honest. These observations are from all of the videos seen on the topic, and not based on personal experience because I wouldnt bother wasting my money on this stuff. Tom.