- This 12V 3.0" aluminum intake elbow for your 1994-1998.5 Dodge 5.9L Cummins diesel is built from Tig Welded 3.0" mandrel bent tubing. Designed to increase airflow, spool-up, engine efficiency and throttle response, this intake elbow features a 1/2" thick flange and 3 1/8" NPT Ports for easy installation of a Nitrous, Water/Methanol injection system and boost gauge / Air Temp gauge. Works with and without factory grid heater.