hey im a noob to mustangs and i just got my 98 GT not too long ago. i decided to put on a BBK X-Pipe, and dual flowmaster mufflers, and ever since then my "check engine" light has been on. i recently did a full oil change and coolant flush, thinking the fact that i was overdue for the oil change might have been the issue, but it didnt make a difference. im definately thinking its something to do with my exhaust system, and the fact that i have no cats anymore. what can it be? thanks