this is for the 4 doors out there. i just changed amps from a borrowed shitty *** autotek amp to my new love... a JL audio 500/1, and on some songs when i turn it up i hear a rattle around the passenger dash. around the air bag/ stock stweeter area. my friend had this in his RSX and it said that the vent might be rubbing with the AC unit. but i don't really know just asking before i take a look tomorrow.