i just bought a 2004 srt-4 stage 2 and im new to this stuff. Could somebody explain how the fuel/air ratio levels work and what level its suppose to be at. Thanks

 

A good A/f ratio would be 11.8 at WOT (wide open throttle). Some people like to run a bit richer than that. The lower the number 11.0, 10.5, whatever, the richer the car is running. The richer the car runs, the less power you'll get. If your A/F ratio is 12.0+ then you're starting to get lean. That's when you're getting too little fuel and from then on, you can break things. If your car is really aggressive and you're running too lean, you're more likely to break things.
While cruising, the A/f ration averages 14.5 which is normal.
The srt-4s come from the factory running very rich. If you get your car tuned they will most likely take fuel out so it's not running as rich therefore you'll get better gas milage than a stock srt-4.