Some decals, a GT-R Badge and a windshield banner that says something like "The Intimidator", or "The Dominator". Ya know stuff like that.
But the windsheild has got to spell it all cool like;
"likqid dstOrtiOn" or "dst0rteD iMgS" or something.
Buy some non-cosmetics.
Wanna go faster for free? Take out everything from the interior except your seat,shifter,steering wheel and dash. All it costs is your time and effort.