MUST READ FITMENT NOTE: REPLACES THE RESTRICTIVE AND CRACK-PRONE OEM CHARGE PIPE. COLD SIDE PIPING ONLY. || Description: Replaces the restrictive and crack-prone OEM charge pipe Cold Side Piping Only Pairs perfectly with Injen’s SES9004ICPH Hot Side Charge Pipe For Optimum performance, use with Injen’s EVO9004 cold air intake Cold Side Pipe Inside Diameter - 3.