Okay, since I have been through this before, let me help you out:

Their insurance will cover, to a point, aftermarket mods so to speak. You might be able to negotiate half price (maybe more, but who knows). Just have pictures and proof of purchase. If there is anything that you can take out and salvage, do it.

I've been through this before. Like I said, anything that is STILL working, salvage from your car - even if it is totaled. It will be less headache the less you have to claim.