Personally, I think a 2 inch drop is a little too low. I don't know enough about suspension issues to get into the effect it might have on shocks, struts, and frame...
But I do know the effect if you use the vehicle anywhere like a daily driver...
I like my 1.5 inch pro-kit, it looks great, and can still clear MOST speed bumps if I slow down enough. I think your taking a gamble on your cats and exhaust if you go much lower....
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"The Yellowjacket"
1998 Mustang GT
13.97@103
"Traction Impaired" or "Nitto Needy"
"They think they can make fuel from horse manure.... Now, I don't know if your car will be able to get 30 miles to the gallon, but it's sure gonna put a stop to siphoning."
- Billie Holliday