Before buying a 2005 Ford you should know the vehicles history as well as how many previous owners it has had. In addition knowing the blue book value of the vehicle will insure that you do not overpay.
Before 2005
If the engine in that Mustang is maintained properly the catalytic convertor should last the lifetime of the vehicle.
To find information about the most suitable tires for your 2005 Ford focus i suggest you go to www.reviewcars.com/2005-ford-focus where you should be able to find the relevant info.
According to the 2005 Ford Taurus Owner Guide : ( " regular " unleaded gasoline , 87 octane )
If purchasing through a used car leadership, it is possible to inspect it first hand. If the agent is unable to do so, it is best to avoid purchasing such a vehicle.
It should be located in the air in take tube after the air filter and before the mass air flow sensor.
2005 Ford Freestyle
a 2005 mustang GT . You are talking about ford Shelby right?
Make sure the truck run well and the car is inspected for defunct and improper care.
Ford recommends changing your transmission fluid every 30,000 miles
In a 2005 Ford Expedition : ( " regular " unleaded gasoline , 87 octane ) for your 5.4 / 3V engine According to the Owner Guide
" regular " unleaded , 87 octane