OK. I'm not so up on the A/V. I leave it up to a friend of mine. Anyway, i'm changing my stock radio in my SRT to a pioneer D3. My friend said you'll hear a difference just from changing the head unit. My question is if I swap out the speakers in the links below, Do you think thats good enough or should I add an amp and which one. I'm just looking for loud crsip music but not window shaking (anymore) Thanks.