MUST READ FITMENT NOTE: ONLY FITS SELECT DIESEL MODELS LISTED. THIS PRODUCT IS NOT CARB EXEMPT AT THIS TIME AND IS NOT LEGAL FOR SALE IN CALIFORNIA OR USE ON VEHICLES REGISTERED WITH THE CALIFORNIA DEPARTMENT OF MOTOR VEHICLES. || Description: Hot Side Piping Only - Complete system is available - SES9004ICP Pairs perfectly with Injen’s SES9004ICPC Cold Side Charge Pipe for Optimum performance, use with Injen’s EVO9004 cold air intake Hot Side Pipe Inside Diameter - 3.