#1 (a) Better brake pads and (b) SS lines. Even the sport package brakes aren't that great.
#2 For power, (a) a set of humble K&N panel filters (with or without "smooth tubes" and (b) either HFC's or TP's (ideally resonated). The OEM exhaust will sound plenty rumbly after that. (c) Cat back's are pricey on this car, so I always recommend finding someone else's "take-off" Nismo H-piped exhaust as the best bang-for-the-buck upgrade.
#3 overall chassis tuning to suit your needs -- sways, springs, shocks. OEM aren't bad tho'.
#4 tires - go wider rubber on the rears.
Doing #1 a & b and #2 a alone will make a very noticeable difference in how the car feels and performs.
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Enjoy it. Destroy it.
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