Thus far, it sounds like Dinan is the best value (HP/TQ gain per dollar spent). I will know what the results will be and it is all matched for other components. As I have done with my 4.6 I would add Meth injection system and a shot of nitrous. What's the flaw in that thinking?

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas