Hey whats up, this is my first post. I just installed two 10 inch subs(DXI104). My question is, why am i not getting that trunk rattle? I had two kicker subs that banged foreal! Trunk rattle, rearview mirror shaking etc. The only thing i changed was the subs. The amp is MTX thunder with 400 rms; is that the problem? Do i need a bigger amp? and what about this break in period im hearing about? will that give me the sound i desire?