Hardware mods

Hey,

I have been running stage1 xcede SW only on my N54 for 2 years now, I think it is time for an upgrade :D

Where can I get quotations on the following:

DP's and full exhaust
Intakes ( I have seen the injen and JB4 intakes) which I like

Beside the IC's what other mods are good to do on these beemers?

If someone can assist please let me know

Thanks in advance