sorry to hear of your misfortune
Unfortunately, no added value b/c of the unproven [flame suit on] new IMS you elected to have installed. I'd be careful even mentioning it... As Jim/L-Bastard said above, the car is expected to run. Plus, you'd have a helluva tough time getting Porsche to qualify the LN/Flat6 IMS as an acceptable OEM replacement part...
Sounds like you're already in an uphill battle for getting fair value for the car. Remember, just like in car sales, the adjusters are pros who 'value' totaled cars everyday for a living. As such, they want to give you the least amount possible. Based on the weak #s out there for Boxsters in general, you'll have your hands full pushing them for the most $.
Good luck and you may consider hiring a profession arbitrator/agency (if policy allows) to help even the playing field if their initial numbers are grim
