A Land Rover, registration AF60 VFE, was stolen from an address at Marsh Lane overnight on Thursday, May 19.
PCSO Sally Hewitt of the Louth Rural Neighbourhood Policing Team said the car now has a snorkel and a winch attached.
And she said the vehicle may also now be displaying false number plates.
If you have any information call Lincolnshire Police on 101 and quote incident 60 May 20.
Dial 999 if you see the vehicle moving.