I just put down a deposit on a Whipple Stage 2 kit for my 6.4, which will be installed and dyno-tuned by National Speed in Richmond VA. They have had a lot of success (620-640 whp) and longevity with this formula without needing to start messing with the motor. After doing some research and consulting with NS, I also decided to add some long tube headers to take some stress off the engine.


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