HAVE A GEN 3 MOTOR IN A SWAP AND WANT TO RUN OUR COVER? MORE THAN LIKELY YOU WILL NEED A EVAP DELETE FOR OUR COVER TO CLEAR. EVAP IS GENERALLY NOT USED ON LS SWAPS SO THE SOLENOID IS USELESS AND WE DESIGNED OUR COVER TO BE AS LOWPROFILE AS POSSIBLE. IF YOU ARE RUNNING A LS MOTOR IN A OEM VEHICLE WE DO OFFER SPACERS TO CLEAR THE EVAP SOLENOID ALSO.