[Slayersan]

So I'm new to to all thing BMW. I do have some mod experience, however BMW seems to be confusing the bejeezes out of me. I have some questions that i hope some one can help...

Are there any short shift kits for the 2.5i 5 speed?

How big of an issue is a motor swap? M54B25 to M54B30?

Is a new amp needed for a head unit swap? Currently i have a HIFI system with the Business CD. (no DSP button, and no navigation, no aux port, no USB) I am looking to do a flip out or Dual DIN if possible.

There is such little info that i can find on the 2004 BMW z4 2.5i. Any info i could get would be greatly appreciated.