I can think of only one thing, and that's the down-pipe issue when you want to keep your A/C.
Using a top-mount will let you have a nice bending pipe going to your exhaust.
513whp on Race Gas; Tuned by Fernando@RacingPartsSolution.com"]
Pump gas? Ppffff!
Part III: Install Handicap Driving Controls
Ma Cah: http://imgur.com/a/TuyYL