Gatsbee13

So I have a 2003 with infinity kappas (their 3-4 years old) and a alpine H/U. I am thinking about upgrading my speakers to latest kappas (60.11 cs) and adding an amp (possibly alpine PDX F-4). my question is, ive never had rattling with my current setup. if I add the amp with the new kappas, would I need dynamat? or should I just get the new components installed and see how it comes out. if it rattles, then add dynamat? Dynamat is expensive, so I want to avoid it if necessary..

any input appreciated. thx!