new headers

[MCCs WS6]

I just put on slp headers with flowmaster y pipe and muffler.. i am getting a service engine light.. and im going through lots of gas.. more than normal.. im not the only one to have this problem.. any recommendations.. advice.. thanx

[nhraformula]

the ses lite went off because youre a/f is off.
as for burning more gas, its gonna be youre driving style.

[MCCs WS6]

my driving style hasnt changed im talking going from 250 miles per tank to about 150 .. i know my a/f has changed.. how do i correct it

[RainMan]

my driving style hasnt changed im talking going from 250 miles per tank to about 150 .. i know my a/f has changed.. how do i correct it

How are your O2's connected? Off road "Y" pipe, No Cats? Running rear O2 sim's? Do you have access to a code scanner? What's the SES code?

Depending on answers to above questions, I'd say you need a tune.

[MCCs WS6]

the o2 sensors are on the y pipe there are cats.. and no simulators