NASCAR 09 Cheats

Walmart Track and Car
From the main menu, go to My Nascar. Scroll down to EA Extras and choose Cheat Codes. From there, you will be asked to enter a cheat code.

Walmart Everyday: Unlocks Walmart Track (Chicago Pier) and the Walmart Car

Achievements
Complete each achievement to get the allotted gamerscore.

Are You Experienced? (10): Win a Sprint Driver Challenge Event.
Chase Champion (50): Win a Sprint Cup Series Championship in Career.
Chase for the Cup™ (50): Qualify for the Chase for the Cup™ in Career.
Craftsman Champion (25): Win a Craftsman Truck Series Championship in Career.
Cross Country (75): Drive 5,000 Total Miles.
Custom Car Creator (10): Complete a Custom Car for all racing series.
Experience Wanted (25): Win 10 Sprint Driver Challenge Events.
Keep On Truckin' (10): Win a Craftsman Truck Series race (minimum of 11 opponents).
Kid Dyno-mite (10): Achieve a Top Speed of 200+ MPH.
Mach 1 (25): Achieve a 761 Rep Rating.
Movin' On Up (50): Achieve a 3000 Rep Rating.
Nationwide Champion (25): Win a Nationwide Series Championship in Career.
Nationwide Reward (10): Win a Nationwide Series race (minimum of 11 opponents).
Online Horsepower (50): Win a Ranked Race on Xbox LIVE.
Sprint Ahead (10): Win a Sprint Cup race (minimum of 11 opponents).
The Ultimate Experience (75): Complete All Sprint Driver Challenge Events.
To the Top (100): Achieve a 5500 Rep Rating.
Top of the World (25): 100 Rated Car for All Track Types.
Trade Your Setup (10): Upload a Car Setup to EA Locker.
Unfriendly (10): Take track ownership from a friend.
We're Talkin' About Practice (10): Record a Lap in "Test and Tune" Mode.
Worst to First (10): Win a race after starting in last place (minimum of 11 opponents).