Ive owned my 2016 Base 6 SP for 1 year now.
1st - WeatherTech floor mats
2and - FI Start button
3rd - Nismo Carbon Gear shift knob
4th - Stillen CIA - immediate and noticeable performance gain.
5th - FI CatBack - just installed yesterday. A little louder than I expected (with 18" resonators). I have not had a chance to drive it much, maybe 10 miles and so far its all been under 50MpH so can't say too much about it, however I do feel there is some extra power there, not sure 'how much.' It does sound cool, louder than expected, but cool.
Next upgrade will either be the pulley or HFC. Not sure which will come first. Pulley sounds easy and inexpensive for a extra 5 HP.
After that its a toss up between coilovers or stereo. Since my home stereo is a $20,000 setup, I don't value car audio all that much.
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