yeah, Cat2 is immobiliser, Cat1 is imob and alarm (and alarm must have a backup battery I believe). As far as I've found out, the S4 has Cat 2 whereas the RS4 has Cat1.
If your insurance company doesn't ask, its still worth telling them if you do have cat1 as they may give more of a discount.
Whichever way, they're gonna screw you royally!!!
Does an S4 bi-turbo have a Cat 1 alarm?
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