i used duplicolor on my 240SX when i made the switch from blue to black interior. its a bad idea for kickplates and high traffic areas, but works VERY well on pillars and places you dont touch. lol. and RIT dye works really well on carpet and floormatts. we got the carpet in my brothers integra JET BLACK and it never wore down or smelled or anything. in fact, we are going to use the same method to die the carpet in his RSX. its cheaper too, you can dye a carpet for like $30 or go buy JDM s**t for like $500