Does anyone know the average monthly payment on a subaru sti?

Go to their website.
Build one.
Use their payment calculator based on what your down payment would be.

Done.

umm you are putting how much down??
Do you have a trade in??
What % intrest rate??
Are you buying used??

to answer your not so much info questions l would say 100-700 per month.

l leased a 06 ST l which l bought in Feb 06 for 4 years with an option to return after 2 years. l only put 2000 down & ended up with a 420 monthly thats including tax. People usually dont lease them cause they wanna mod it out. In order for me to buy it l needed another 1000 in which the monthly was going to be a little higher than 450 with my credit. l suggest u either wait till Fall 07 cause the re-designed WRX & ST l will be coming out. Unfortunately the ST l will only be in hatchback form & its sort of ugly it looks like a crossover so its up to you. l hope l helped.

You should go to Edmunds web site. You can actually pick the car and play around with the numbers on their financial calculator. You can add the tax, interest rate, etc. What l did was, l picked a car that was about $2000 more than what l wanted, and gotten the worst-case-scenario payment. On a 7% interest rate, though, you are looking at around $600 a month for 72, giving $1000 down.