I would definitely do Art pipes if I was in your position. They will take an hour or so to remove and replace with stock cats for emissions versus many many hours and a complex installation process for long tube headers. From least amount of power to most amount of power, this is what I think:
stock cats < high flow cats < test pipes < Art pipes < LTHs.
Or for torque:
Stock cats < test pipes < high flow cats < Art pipes < LTHs
However, you have to realize that the difference between Art pipes and LTHs will be a few wheel horsepower at most.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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