Ok ill bite, because it looks complety and utterly stupid?
Its bad enough when planked on actual rally bred Subaru wrx/sti's but as one of many dodgy stickers on a bright yellow ZR it just looks stupid, regardless of motive or intent
Oh and we both know the type of person that usually has these - probably has little to know idea who Colin Mcrae was or did
Bit like the Paul Walker stickers. Nothing wrong with it technically, but they always seem to be on cars driven by morons.