These kits normally cost a LOT of money, up to $1,000 at times. But I got the kit from Hydrogen Bost Supplies, it was only $40 so I thought I'd try it. It was fairly easy to construct and install, just take your time.
The photo below is the kit, the lid is different though. Be careful how close you drill the holes. I cracked the first lid. First thing I noticed was my car (1984 Mazda Rx-7) seemed to run a little smoother, and start up better. My car has a mild street port on it too.
But the real reason I got this was to improve my MPG. Sadly it does very little, highest I got was 19 MPG. To be fair I may not even have it hooked up right since I did it myself.
If you do want to try this I'd recommend these guys. You can actually get all the part locally if you really wanted to. But it's easier to just get a ready to go kit sometimes.
