Which Hypertech 180 degree thermostat is right for my car (1995 Bonneville SSEi). Jegs lists four of them. Also, what all will i need to istall it.

Go to the auto parts store and get one. Buy Stant. You'll spen 1/3 the money, and get exactly the same thermostat. Ask for the 180 that fits the stock 195 dimensions. The guy needs to know how to read the book and cross-reference to the lower temp.

You need a 10mm socket and ratchet, as well as something to clean off the fiber gasket from the water outlet and lower intake, without scratching either, or getting all that crud into the intake (stuff a rag in before scraping).

Make sure you get the fiber water outlet gasket, and the rubber seal for the thermostat.

Im with will on this one I just got mine from advanced auto, same thing basically...

Do you have to have the other gasket or can i suprpass with just the o ring gasket.

You need both gaskets, the other one (not the o ring one) can be purchased at auto zone or advanced auto for $2.xx

I'd like to take a moment to hijack for a sec
I have an undrilled 180* thermostat in my car right now... would 160* be too cool? I'm running that on my other car, but it'* recommended for it.

With out more mods like rockers etc, stick with the 180 but drill a few holes in it. 160 is a bit too cool.

alright, thanks

I drilled four 1/16" holes in mine. Works great