Anti roll bar/strut bar/etc

[KKJJ]

I have installed a strut tower bar and a anti roll bar on the front of my car,my front suspension is MacPherson Strut with coil spring,my rear suspension is Independent Tralinng arm with coil spring,I just cant put any strut bar or stabilizer bar at my rear suspension,but I want to put any possible point a bar since I notice such a big difference after I installed the two strut bar or anti roll bar or whatever.I have a friend has a total of 6 bars in his car,two at the front,two at the rear,and two inside the car!

So here comes the question,one of the strut bar was installed under the front seat and between the front and back doors point,hope you guys know where is it,it's like trying to hold the car's body making it harder at the both side.What will it makes the difference?I really don't understand the theory,can someone explain to me?

The last strut bar was installed at the rear seat's safety belt point,so you can see the bar from the rear window (again hope you guys know where is it),so my friend told me he notice more oversteer when cornering at high speed after install that bar in his Front wheel drive car.Is that true?

[youngbex]

im really sure what you are getting at, but stiffer the car better conering etc. so maybe your friend thinks your over steering but jsut may not be used to seeing your car not body roll so bad.