i've had the black magic #175 for a few months now and it has worked great, not a single complaint. however, i keep good maintainance on my car, including flushing the cooling system every six months or so. the kit is very easy to install and includes everything you will need. i got mine from brother's performance for around $220 delivered. and as far as all the "black tragic" comments you will hear, i did alot of research before buying mine because of all those comments, and I found many more people who are happy with the black magic than people who are not happy with them. go figure.