Re: 16" wheels
You have to compare the weight of your car to his Nissan - the laws of physics only allow a Falcon to corner so fast.
I was really impressed with the difference my 16" wheels made. I think it's a good compromise because 17s and upwards weigh much more than I'd like, and have increased rolling resistance.
Also be sure to check your tyre pressures.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S