I'm not sure exactly what you mean by "MBX-5 VSThe prospec"??.......there is a standard MBX-5 version that mugen produces and then there is the MBX-5 PROSPEC version they make. The Prospec is the buggy with all the high end shizzle hop up parts , such as upgraded shock towers and so forth....VERY AWESOME BUGGY!! i myself race a kyosho brand buggy (still with the ol' trust worthy Kanai 3) , but kyosho's newer buggies are the 777 series.........which are supposed to be a little better than the older "kanai" versions. As far as the MBX-5 buggies go...........you can't go wrong with either the standard or the Prospec version...very solid buggy , and i would take either a kyosho or a Mugen before i would take any ofna buggy. Ofna's aren't bad , but i'm just not a fan of the quality of parts they make. my $.02




JEFFRO503