Sup guys im on the fifth gen forums ince i drive on but my sister has a fourth gen. Well to make thisn short we changed out her hole exhaust y pipe then pacesetter cat back but no intake, can this maek any problems? Also She got a check engine light out of it throwing a p1400 code, one of her friends at work husband work for mercury and he did the diagnostics on it he said its a DRFE Sensor, if any of you guys know what that is plz help me out thanks.

 

EGR solenoid valve or circuit fault, read the stickys for further information that's p1400.

Not having an intake is ok with exhaust modifications, why wouldn't it be?