Unlimited Class
Impreza V5 or V6 STi
V6 can be bought brand new in GT3. Old STi's can be found plenty in one of the used car garages in GT4. Make sure the version you get weighs 1270 kg (Ver2 weighs 1240, so no go).
There is only one rule for modding, no NOS in GT4. Other than that, go nuts with the car. I think this is fine because some people will actually tune their car to go slower or to be less stable.

Midfield Raceway
1. 1'06.749 - Brat4by4
2. 1'08.554 - bmxkelowna
3. 1'10.200 - Imprezive
4. 1'09.916 - stipro
5. 1'11.093 - legacy92ej22t
Stock Class
Legacy Touring Wagon GT-B (GT3) or
Legacy Touring Wagon 2.0GT (GT4)
Both of these cars can be bought in the dealership in each respective game. They both have 276 hp and weigh 1430 kg.
Mods are limited to Chip, Med. Race Tires, and Brakes. A little horse and some safety items.

Midfield Raceway
1. 1'20.725 - Brat4by4 (2.0GT)
2. 1'21.063 - legacy92ej22t
3. 1'21.766 - bmxkelowna (2.0GT)
4.
5.
Remember screen shots if you can get them (especially if you take the number one spot).
And some driving tips so we can hopefully even out some of the competition for the non-performance drivers:
1. You must use the whole track to be going your fastest.
2. Look up something called trail-braking.
3. Learn what suspension settings do what, and only change one variable at a time.
4. Your racing line is much more important than your actual speed. You can go 20 mph faster through a section than another car and be passed by the slower car.
5. Slow in - Fast out of corners. Just not too slow. And slideways is rarely if ever the fastest way. No matter what the car... if you are not full throttle through turns 2 & 3 (big s-bend) you can forget about a top time.
Post up your times and I will update the first post. Have fun!!