First of all, let me say I'm sorry about the loss of your grandmother.
I have a 2001 Mercury Grand Marquis and it is PI but it also has the plastic coolant cross over and I have a near new 2003 PI intake with aluminum cross over off a CVPI that I intend to install.
I love the car, it was Non HP meaning single exh and soft suspension, but I added Bilsteins and Addcos all way round and it went from a barge that plowed badly to a curve loving animal. I also added complete dual exhaust from a 2001 CV with HPP (except resonators, I used long TPs
)and the lacey spoke aluminum wheels. It still has the 2.76 rear which suits our use which is a road or trip car.
It's been across country several times, it has about 65,000 on it now, gas mileage runs from low to mid high 20s. In 2006 on a 7.945 mile 21 day trip to Ca. and back with lots of running on old Rt 66 and Sequoia, Yosemite, Yellowstone, Rocky Mtn Nat Park, Nevada, Utah, Wyoming, etc ... overall average of just over 26 mpg and we had her stuffed with our things.
Huge trunk! I did add air bags which stay near empty except when toting a load or pulling my trailer. Added a cooler too. Thinking time for mild J-mod.
I had the steering wheel replaced under warranty because the leather was cracking a few years ago.
Been a good car with no issues since we purchased it December 2001.
I've had the lest three state police cars I was issued as Crown Vics, a '98, a '00 ( it was a reissue that already had 25 hard thousand miles on it when I got it
) , and my last car was a '06. Normal maintenmace is all they took for thier lives, the '06 I turned in at 86K and another trooper has it now, still here and running though it did need a new cat on the rigfht side recently, near 115K now. The '98 and '00 went up over 120 and 135K each.
Dependable cars, tough, roomy, comfortable, and easy to find parts for for a long long time.