I am one of many examples of not staying at 6psi. Figured it'd be enough. Now I have a MS, Injectors and a fuel pump waiting to be installed. All of which was bought on this forum, at very reasonable prices.

If you are broke, not a problem. Awesome deals come and go everyday, hang around and you will get what you need at a good price.

1.8 rear end. i hear 90s wont hold up.

Get the car, search all the forums for good deals on stuff to do it right. Spend your free time reading about MS or whatever tuning you plan on doing, then when you get the EMS, and mods in, you will have some idea about what's going on. 10 minutes in a book(metaphorically) beats 10 minutes with your head sideways thinking WTF? I am thinking about buying an MS kit, and I dont even ahve a miata, or a car to put it in, just so I can get a feel for it's workings and check out the parameters.