Industrial Injection Dodge Viper Phatshaft 64 Turbo For 2004.5-2007 5.9L Cummins - 3642406512The original PhatShaft is the perfect turbo for quick spool and low end performance. The Phat Shaft turbo also has the overall volume for overall torque for efficient full throttle power. The PhatShaft can be purchased with a 12 or 14 turbine housing matched with a 65mm turbine. We suggest a 12 cm turbine housing if the engine is a 12 Valve and has moderate fueling upgrades such as 300hp injectors and a camplate. If the engine has heavier fueling