I had the Stillen shorty headers on my car a couple years ago, matched with FI high flow cats and FI catback. The car was tuned prior with just the HFCs and the catback. The headers made gains, but I felt the gains weren't enough to justify the cost of the headers + installation.
I also didn't like how it took away the stock VQ note.
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'08 Infiniti G37s - Forced Induction Fed
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