Met a FL brother I think same color as yours few months ago at mamaks. Ady saw him parking and tumpang table with me. Lite brownish granite grey color. The abang really got heart playing with his car, some sharing from him may be can benefit you. Things he shared as below:

1) Grounding on transmission. According to him change gear become very efficient with minimum shiftshock.
Done, but dunno correct point or not.
2) Soak throttlebody with high density electric oil(dunno what oil is that), so the throttle response improve
veli intresting....
3) Grounding spider inside cabin, include TCU and ECU. Didn't know the effect, butt dyno show many improvement.
errr....
4) Ekzos tip 3 inches
why muz be 3inch?
5) Due to standard trim doesn't have door side lining, added a white stripe across the lower section make the car look extremely sporty
dah ada
6) Seat cover all use blue trim TYPE-R (totally disagree with this 1 as the color scheme looks like pasar malam) but surprisingly very comfortable and cooling due to the padded seat cover! Wouldn't mind if those seat cover is in black without the bloody TYPE-R wording ono it.
stock better
7) Self modified TYPE-R shift knob after the stock release button has broken. Don't know how he did it, but that's the 1st time I've seen a GaGa auto with after market shift stick.
i ada aftermarket but screw lenght not ngam so didnt pasang..
8) Plotong Shawie handbrake handle with metal hairline brushed wrapped
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9) Stock steering with PCV wrapped on red stitch. Like dares got a red tie at the 12 O'clock position.
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10) 2nd hand GaGa rear speaker plonk at the front door
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11) Tweeter kedai abang for RM10/pair x 2, double tapped on A-Pillar and C-Pillar
done but not in pillar
12) Voltage stabilizer for head unit
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13) Huge LEGALIS R sticker on the torsion beam Despite it sounded lala, but it looks good have some wording at the plain tofubim
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14) The usual multiple facebook sign/no urine/no smoking sticker at rear door which I strongly disagreed
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Many more tiny little thing which cost literally nothing but improved the ride quality many fold he did to the old FL. I'm impressed. I hope u get some idea on this short sharing