Once again, another problem with my impala....

Well it turns out i have ANOTHER problem with my impala. Today i put a new muffler on my car, I put whats called a Turbo 2 on it. It makes a nice hum when the car is running. Well heres the thing, my service engine soon came on about a mile after i put it on. What could be wrong with it NOW. I'm thinking some kind of emissions problem is there anything i can do without haveing to spend money on the expensive one that the car requires????? Maybe not enough back pressure on the motor???? I don't know, but any and everytime I do something to it, it affects something else. These cars are a pain in the ass!!!!!!!!!!!!!! :banghead: I'm so tired of it, most of the miles on it are to the dealer, but hey it doesn't cost me anything and i get some nice loaners :icon16: Once again let me know

thanks guys and gals,
mike

yes, it has to do with emissions.

co2 censor came off