1ftwang or 1ftdong (you mean you dont?)
thxiknw (perfect reply to "sweet car bro")
blown (wicked double entendre)
urmom (immaure, but cmon!)
X32 GM0 (look at it in the mirror, like when someone sees you in their rear view)
I dunno what the goal is here! Something you'd actually want on your car? This is my list, feel free to steal anything
I8URV8
AWDGRIP
ITSBKWD (too clever? ITS backwards = STI)
RWDHAH
SPOOLIN
BOOSTIN
EJ257
OBPGDBF
XXXAWHP (XXX to be filled in after a dyno)
BOXER4
ESTEEYE
ESSTEYE
BUHBYE
IH8PPL
WOOSH
FWD&RWD
FISTI (Feisty and FI STI. Too clever ?)