Did some poking around and can't find a direct comparison between the stock nismo exhaust / FI / Stillen. Suggestions? I'm not going to swap it out based upon exhaust note alone.
If I'm going to do HFC, might as well do the headers at the same time. The garage that will (more than likely) do the work isn't going to charge me extra for the headers if I do the cats at the same time. Fairly certain HFCs do have noticable gains - don't they?
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