Stay with the directions. It goes together fairly easily. After installation you will have to find the best adjustment for your driving style. It will change the car from "tight" to "loose". Some drivers like a loose set-up, some like it tighter.
I agree with wpgfordguy. It is a great low budget mod. Good Luck.
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1965 Mustang FIA vintage road race car
1995 Mustang Cobra R
1994 Mustang Cobra (purchased new)
2004 F350 SD XLT Sport 4X4 V10
2010 Mustang GT w/ Track Pack
1971 Porsche 911
1973 Porsche 911 2.7L
As an experienced performance driving instructor, I would advise all to be cautious about increasing rear bar strength. Doing so decreases the overall rear traction of the car and leads to more "Loose" or oversteer.
I once had a Corvair that tended to understeer in certain low traction conditions. I talked with John Fitch (Race driver and Corvair guru) about solutions and he suggested disconnecting the front bar, which I did. At lower speeds in wet or snowy conditions, the understeer was reduced. However, at high speeds the car was scary loose. I reconnected the bar even though I do a lot of oversteer practice.
Most drivers can deal with understeer and that is why cars are set up to understeer from the factory. I have found that most drivers cannot deal with oversteer. Oversteer requires lots of practice, proper usage of the eyes and hands, and not lifting off the throttle with a rear drive car. I have seen all of the above occur on the track.
I have found that, with street tires, our Mustangs can be balanced relatively well just by adjusting tire pressures, more in front than rear. I seek a car that understeers at neutral throttle and oversteers with power on.
I once had a Corvair that tended to understeer in certain low traction conditions.
A Corvair? I have a Porsche which also has the engine where the trunk usually is located. You can easily suffer from "oversteer snap" when pushing a car with a rear mounted engine. It occurs when the an oversteer condition starts, and the driver decreases the throttle too much. The car will violently "snap" in a violent manner.
A car with a high rear weight bias needs to be driven in a different manner than a car with the engine in the front. As such, you must also use a different racing line.
Quote:
Mustangs can be balanced relatively well just by adjusting tire pressures, more in front than rear.
I've had a racing license for 17 years. I would suggest these adjustments to a RWD Mustang to decrease oversteer (which increases understeer):
smaller rear bar
larger front bar
softer rear shock
stiffer front shock (or coilover in you have a S197)
softer rear spring
stiffer front spring
less negative camber in the front
lower front tire pressure
higher rear tire pressure
wider rear tire
Nonetheless, I prefer a very loose car. So, I set my car up in the opposite of what I mentioned above. A Mustang is a relatively heavy car, and one can use the loose condition (oversteer) to help turn the car in a corner.
Steeda Adjustable Swaybar 
Stroke It And
I have a Porsche which also has the engine where the trunk usually is located. You can easily suffer from "oversteer snap" when pushing a car with a rear mounted engine. It occurs when the an oversteer condition starts, and the driver decreases the throttle too much. The car will violently "snap" in a violent manner.
