APPLICATION:  
My car is a 1996 V-6.  In so far as I know, this same set of tires and wheels can be installed on any '94 up Mustang. 

TOOLS REQUIRED:  
None for mounting the tires on the new wheels and balancing them because I had this done by a professional tire shop.  I chose to install the mounted tires myself to make sure no one used an air impact-wrench on my new chrome lug nuts. 

The jack and lug wrench that are provided with a Mustang are really designed for emergency use only.  To mount new tires and wheels requires a hydraulic jack and a good after-market 4-socket lug wrench.  You also need some hardwood blocks to place strategically under the car and behind each of the three grounded tires as you remove and replace individual wheels.  This minimizes the possibility of personal injury and of damage to the car in the unlikely event the jack should slip or fail.   

TIME REQUIRED:
My car was in the tire shop a couple hours.  Installing the wheels and tires took an hour or so.   

COST OF THIS PROJECT: 
The four 1998 Cobra wheels were $530 and the Nitto NT555 245x45 ZR17 tires, chrome lug kit, and chrome stems ran $803.22.  I paid $36 to have the Nitto tires mounted on the Cobra wheels and balanced.  The Cobra valve caps were $24.95 (yeah, I know, I must be crazy).  Total cost $1,394.17. 

WHERE TO GET THE PARTS:
I purchased the wheels from Powered by Ford in Orlando, Florida (407-843-3673) and the tires, lug nuts, and chrome stems from the Steeda Mustang modification facilities in Pompano Beach, Florida (954-960-0774).  The valve caps were ordered from The Ford Collection catalog (800-444-4503). 

WHY MAKE THIS MODIFICATION?
Looks and performance. 

WHAT I ACCOMPLISHED:  
A better looking car and a better handling car. 

PHOTOS: 

1. The new tire and wheel combination

2. The Cobra center caps

3. The Cobra valve caps

4.  My Mustang with the wheels and tires installed

HOW I COMPLETED THE MODIFICATION:
I purchased the wheels one place and the tires another.  I then had them mounted by a tire shop that specializes in after-market wheels and performance tires.  My goal was to avoid any wheel weights on the outside of the wheels for appearance reasons.  This was achieved by using stick-on weights on the backside of the wheel as close to the wheel centerline as possible.   

The final balance using this method is not as perfect as the usual approach of installing weights on the front and back of the wheel.  However, with high quality tires and wheels very acceptable results can be achieved.  In my case, I have a barely noticeable vibration at interstate speeds.  I have experienced worse vibrations with stock tires and wheels balanced the standard way.  The key is to find someone that really knows how to do this specialized balance job. 

When you make a change in tires and wheels, it is necessary to consider the potential effect on gear ratio and speedometer readings.  It is also necessary to be sure the wider tire and wheel will not rub.  Some quick measuring confirmed fit was not going to be a problem with the width tires I had selected.   

The stock wheels on my Mustang were 15-inch.  The Cobra replacements are 17-inch.  However, because of a much lower profile design, the mounted height of the 17-inch Nitto tires is almost precisely the same as the height of the 15-inch tires that came on the car.  The end result being that the new tires and wheels have almost no effect on gear ratio or on speedometer readout.   

A reminder - high performance tires have a rotation arrow and are designated right and left.  They must be installed on the car to rotate in the direction of the arrow.