Alan I agree about the front speakers but I thought stock BMW speakers are plenty good enough. BTW I was in the process of getting the 640R but I'm changing to 647R now. I just like the 5-spoke look better.

I got rid of the factory amp.

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Dinan S1 pkg / 22" Iforged Swift - Toyo 295F*315R / Eisenmann Race - OEM tips / H & R 15mm front
30mm rear spacers / Euro-spec headlights / CF M Competition steering wheel / Full CF interior /
6000K D2S / HID fogs / AiBrights V3 / Interior Xenon / LED sidemarkers / Matte black grille & hood vents