Yes, an alarm will be just fine.... Most Mustangs have them these days.
I imagine you are looking at about $300-$350 to have an alarm installed that included keyless entry. Believe it or not, I think it's worth every penny. I installed most of mine myself to save some $$, tho.
I bought a keyless entry system a while back from JC Whitney (yeah, I know) but it was a lot cheaper than an alarm and it works great. I stopped using it several months ago since my actuators are shot. I'll sell it if anyone is interested. PM me.
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