Wassup fellas. My friend has a 1995 Mustang GT. He recently had an x-pipe and two flowmasters installed. The x-pipe took place of the catatlytic converters. Because of this, the "service engine soon" light comes on. What can be done to keep the light from coming on. Thanks in advance for the help.

Did he put the O2 sensors back in??

Yes.

All vaccuum lines reinstalled?? Disconnect battery for 30 mins to reset computer, then put back on and see if it still lights up

Okay I'll tell him to try that. I doubt it will work though. It doesn't come on until you drive down the road for a while. It seems to me that you have to either replace the actual 02 sensor with a dummy, or trick out the one that's already there to make the computer think that everything is in perfect working order. That works on a Chevrolet.