^ What he said. I also did Stillen then FI. The FI is built better, fits better, obviously has a smoother flowing shape, and weighs less than stock (Stillen weighs more). None of the decent exhausts on this car differ appreciably in performance, and if anything FI's catback is one of the best-performing ones out there. However, Dynos will be Dynos, and all the gains are within the margin of error as far as internet comparisons go.
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