If you have a regular passenger car like Civic, Accord, Camry, Corolla, Altima etc., you can install a Upper Front Strut Bar and make a noticeable difference (even the wife noticed it) in the handling. This trick is one of the oldest for all those Rice-boy cars you see on the streets. But you dont have to look or sound like them to squeeze a little better handling from your car. It also makes the car safer in corners as the stabilizer bar makes the outer (outside turning wheel) front wheel stick to the road, instead of lifting off the road due to the G-forces rolling the car.

depending on Make/model of the car
Time to install: 30 mins.
Tools required: 2 wrenches
Skill level required: Novice
No Jack required.

A strut bar is a stiff metal bar that connects two front or two rear struts on a car to prevent the chassis from twisting under G-forces in turns. I had asked my auto teacher if they really work like you read online and he confirmed. They are good things to have.

So I bid on this strut bar on ebay for 99 cents and got it shipped for $24 (It is a long & heavy metal bar. So S&H cost is justified). To install all I had to do was to remove 5 nuts from the top of each front strut and put in the bracket and tighten the nuts back in to the torque spec. These are accessible from under the hood. No need to get under the car or jack up the car. There is absolutely no downside to this modification. Actually it is not a modification, its just addition. It strengthens the chassis of the car. More expensive cars come with the whole strut bars sets installed from the factory. This is one of the reasons you get that tight feeling on those expensive cars.

It is totally worth that $24. You have to understand that you can pay a lot more money ($100-200) to buy a stronger sport quality strut bat to make an even bigger difference, but that is totally up to you. But if youare not sure if it would help, Try the $25 experiment. It definitely wont hurt if you tighten those nuts to teh manufacturer recommended torque specs.

Some pictures:
                

Its just these 5 nuts. Dont worry, nothing will fall off when you remove these nuts during installation. The weight of the car is pushing the strut up. DO NOT JACK UP THE CAR FOR THIS INSTALLATION. Most Suspension nuts are tightened with all four wheels on the ground, i.e. loaded.