ok, heres the deal, i have a clifford alarm system the came with my car when i bought it, and i dont have any books for it, nor to i know the model number. my question is how hard would it be to add several more battery backup alarms to the system? and where could these be purchased?> thanks for any help

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1997 Cavalier 2 Door
Hu: Clarion DXZ-635MP
Front: CDT M6's', DRT-25's, 560's
Rear Fill: Polk Audio db690
Amps: Hifonics XX Goliath, 2 ED nine.2's
Subs:
Wiring: 4 run Knuconcepts 1/0 ga w/ Big 3
Alt: HO Delphi 160a

WTB: 2 Kinetik hc2400's, Pioneer 880prs, 2 Audioque HD312's