all protege5 exhaust systems fit on MP3s, BUT the TIP of the mufflers are gonna be about 5"s too short, since the protege5 is shorter. You can literally take an MP3 exhaust and hang it on a protege5, but the tip will stick out 5"s, so you have to have the tip shortened by a muffler shop. I don't think you want to lengthen a tip tho, to put on a mp3, it may end up looking weird.