ISR headers for budget, PPE headers for the best performance.
Z1 headers are also similar in performance and sound to the PPE headers as they're equal length.
FI LTHs are junk IMO, unequal length and not the best for performance. I have them currently on my car after swapping out the Z1 headers I had. Car lost power and started sounding like **** with the FI headers.
Swapping to PPE headers next week.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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