Is this a good idea?

Alright, im tired of having a truck so im looking for another stang. I found an 02 mineral gray gt with a shaker hood, mach 1 rims, and the mach 1 spoiler and they want 13k for it, has 56k miles. Is that a good price, it looks flawless and is a 5spd. Also, if i can get the car for less, should i get the loan for a little higher and buy a mongoose s/c kit for it and get some money for rims? i have a little money saved up especially since i just sold my eibach sportlines for 202.50 on ebay which i think the guy got a steal but o well, no use for me. What do you guys think?
 
What would be a good price on a gt, i know many people will say dont do it and get a cobra or something, but im not really into speed much anymore i just want another mustang and my gt was plenty fast for me, especially if i put a mongoose kit on it once i get it. Let me know what you guys think
 
For some reason around my area the prices are always high. They are trying to sell an 03 here in town for 16k right now and they will probably get it. if they wanted a normal price id go buy it but the dealership told me they will only give me 11k for my truck, screw that
 
see im the opposite. i dont care for the shaker hoods or the 01-04 wings. 01-04 side skirts and headlights are better, but i like the 99-00 wing way better. But whatever you decide, good luck with getting a good price in your area.
 
ill need all the luck i can get around here. I'm more than likely gonna drive the hour to st.louis and look around there, thats where ive found most of the gt's on autotrader. If you buy the mongoose kit from mph, do you need anything else in the drivetrain or can it handle the stock as long as its not drag raced?