Yikes! Good luck man! My dad went with me to look at a Mustang when I was 16 and laughed at me when I said I wanted it. Needless to say, I went home in a CRX SI. Not bad but it was probably the best car for me at that age. I think if I had a Mustang at 16 I wouldn't be here now to discuss it. You could be more controlled than I was and if that's true, you could tell them about the traction control, anti-lock brakes and dual airbags. Tell them you don't care about how fast it is but that you just love the looks. Tell them you will make a deal that if you get a speeding ticket in the first 6 mos of owning it they can park it for a full month.
These suck but I'm trying for ya.. 
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formerly 96cobra89lx306
(96Cobra/softtop- Black&Tan, 3.73,almdrvsht,fancontrl,steeda sbfrmes,r-LCA's&shifter,eibachspgs,KYB's,FR-upper arms,Y2K Cobra R's,pulleys,Bassani X pipe(cats gutted),C&L 80mm,Stage 2 Clutch, polished intake and cam covers etc.. last dyno w/cats on-287rwhp.
93 Ford Probe Gt 4.39 stock gears and K&N (slower but turns)
2001 Green Ninja ZX6R
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