i installed the rs3200+ kit. was pretty much "plug and play", one big harness with a bunch of plugs (which fit only one way so no way to mix it up) and the brain unit... my 02 came with factory keyless only so just added the kit, can't remember the cost but think it was a bit over $100 online.......isnt the greatest alarm but better than nothing, and at least its all stock so if problems occur dealer "should" be abe to troubleshoot.....