so i got my header installed which was a biatch......last night i took my car out on the highway and i started ripping it up cuz i like the way it sounds and i wanted to tested out with the header. so i was doing pretty good...never topped it out or nothing but i was doing a good 220 k.....it was running and sounding pretty good...i came back to town and i heard it soung a lil weird and bogged down, never turned completly off but just about....it was making kind of a lil whistling sound...but the light never came on last night, this morning it came on when i went out for a drive....and i still hear that lil sound...

i just disconected the battery to try to reset it and i cleaned up the header cuz the paint is peeling so i thought that the paint cuz have made contact with the oxygen sensor...waiting about an hour and try to started again....if not ill bring it to the shop i guess......
please help....any ideas....

 

get it to autozone and have the code scanned ... we can guess all day long