Personnally if it was me i'd go for sat nav, but it depends on how often your getting lost. But if you really need the extra downforce go for the spoiler
Retrofit Armrest. 4300k HIDs. Ipod Link. 18" Nine Spoke Alloys. LCR Front Splitter. Debadged. Ambient Lighting. DIS. Cruise.
How often do you drive long distances to get lost?
I'd go for the Spotties personally, then Spoiler, Sat Nav.
If you do do alot of travelling then would go for Sat Nav first, and a Tom Tom at that
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