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I like the Denny t since I got it for free from a giveaway here it adds a good amount of power and only smokes when you want it to. I took it out and detuned the pump a bit when diesel went above $4 a gallon
DennyT stage 2 is basically the same as a M5 full fuel all the time vs less aggressive pins basically. The stage 1 is better for daily driving as far as low boost control.