New HU?

I have a 2001 Dodge Dakota xcab w/ the Infinity upgrade. I'm not looking to blow the windows out, but I do like to listen to it loud most of the time, which leads to this... The HU is the stock unit and the amp is the stock unit. I've replaced the 6-1/2 components in the doors w/ Alpine SPR-17LS, however, I've swapped the tweets for Audiobahn AT65 (sound better to me). I've also replaced the rear coaxials with Alpine SPR-17LP  6-1/2 coaxials. It sounds pretty good to an old guy, but, it doesn't turn up as loud as the old speakers. The guy at our local audio shop says that I need to replace the HU and bypass the factory amp. I'm looking at a Pioneer DEH-P4700MP, will this correct the lack of volume and if so, how crazy is it to bypass the amp?Brooks

the amp bypass is not that bad, just locate the amp... run there own wires to its loacation (the speaker lines are there).... to be honest... i dont think you will be happy after they change the radio. the radio will not power the components well and you will still have distortion and semi-higher volume. if you were to do the radio with a 4 channel amp and give all the speakers so clean clear signal.... you will be amazed !