If you really need the pudding proof you could order a 180hp and try it a/b test like me and keep the one you need, Axiom is king when it comes to upgrading (need to keep in mind that the tweeters are the new versions also so depending when you purchased your m100's you could have the new or older tweeter versions, but then again if need be Axiom could probably put the older style tweeter in the 180Hp