Should. Everything but the body panels is exactly the same. The Matrix has the same engine, airbox, throttle body, motor mounts, fuse boxes and all that.I just did a quick check on K&N stuff, and their CAI's are the same part number for both the Matrix XRS, and the Vibe GT for 03.
03 GT, Abyss with tupperwareTo Do List: (will take a long time)Front/Rear swaybarsStrut tower barTint windowsReplace rear bumper cover (previous owner rear-ended)Replace upper front bumper cover (cracked)Replace VVTL-i engine cover (previous owner was Hercules)
It will fit, but you will have to fight installing it with the Vibe's headlight as it is a different shape than the Matrix (this goes for any CAI with the Vibe). Once you get past that, you are all set.
2009 Jet Black 2.4L Auto / Fogs / 17" Alum / Clear Bra / Camry Leather Shift Knob / GT Rear Spoiler
2013 Polished Metallic Honda CR-V EX-L Navi