To get all cars type-Allcars:
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To get different traffic cars type-
go01,go02,go03,go04,go05,go06,go07,go08,go09,go10,
go11,go12,go13,go14,go15,go16,go17,go18,go19,go20
To go fast type - gofast(only in single race)

short cuts:
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Aquatica
1. After the initially left, right, right, right turns, now
during the next long and gradual left turn, there is a
shortcut entrance in the right wall. Upon exiting the
shortcut, turn right.
2. Right before you go through the tunnel that takes you
back onto the boardwalk, you can go off the road to the
left and go over the tunnel, and land back on the track
on the other side. It doesn't really save any time, but
if it's a choice between going around and slamming into
the side of the tunnel, go around.

Atlantica
1. After driving past that "Electronic Arts" landmark
(at roughly half way into a lap), take the left path,
then right. You'll immediately see a shortcut entrance
in the right wall. Upon exiting the shortcut, you'll
need to turn right.

Country Woods
1. (Backwards) There is one difficult left hairpin
turn after all those 90 degrees sharp turns (at about
half way into a lap). Instead of making that hairpin
turn, do this: A few seconds before approaching that
hairpin turn, you can make a sharp left turn (with the
help of your handbrake) and drop to the lower level.
While still in the mid-air, continuously press that
L1 reset button. You'll immediately recover from that
crash landing and "skip" that hairpin turn. This saves
you at least 3 seconds. One other trick on this track:
there is one big and high jump at the beginning of this
backward track (your car hitting the roof of the tunnel).
Once landed, keep straight and accelerate all the way till
you hit hard at the wall. When you crash, immediately
press the L1 reset button to continue. This way you don't
have slow down to make that 90 degree turn and can easily
gain 2+ seconds.

Empire City
1. There are light poles on your LEFT side when you
just pass the start/finish line. Immediately before
the 4th light pole, you'll find a shortcut entrance.
After exiting the shortcut, go STRAIGHT. There is a
wall in front of you but a little bit to your left is
another shortcut entrance. Upon exiting this shortcut,
turn right.
2. Immediately after the second SET of concrete pillars
(when near the end of a lap), you will easily see a
"fake wall" on your right side. Drive through it and
you'll drop to the lower level. This saves you 2 to 3
seconds.

Redrock Ridge
1. About half way into a lap, you'll have to make a
difficult left hairpin turn. There is an alternative
left turn immediately before that hairpin turn.

Rocky Pass
1. Where you see the falling-rock road sign, right
past that sign, there is a small and short cave tunnel
off-road to you right. Driving through it instead of
making that sharp right turn on the road will save you
some time.