I installed Kooks 1 3/4 with OR/X pipe in May. I have AED tunes and Shaun has access to really tune the Kooks to full potential.
So far, the Kooks are the best bang for the buck, makes a huge difference. Kook recommended that I use the 1 3/4". Helps with low end grunt on the Boss.
Next? Whipple 2.9
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2013 Boss, PW, Recaros, 3:73, AED tunes, Airaid CAI, MGW, Hotchkis springs, LCA's, Whitline Relo and Trans Bushing, Griggs Torque Arm, CHE K Member Brace, '13GT500 Quad A/B's, JLT Oil Separator Kooks 1 3/4" LT's O/R X pipe and other stuff.