I am getting a Z1 unit installed on Tuesday on my 2003 GS 300. I will also be getting the Ipod adaptor, blue tooth, and the rearview camera. Is there anything I really need to know before then? I am reading about you guys getting these Ducatiboy bypasses, do I need one? Does this bypass do the same thing that the headlight flicker trick will do? What should I look out for? Thanks 
I am reading about you guys getting these Ducatiboy bypasses,
Yes, they were very popular.
do I need one?
Only if your Z1 was made before Mid July 06, if it was made since then you only need to ground 2 wire.
Does this bypass do the same thing that the headlight flicker trick will do?
Yes, my circuit told the Z1 that you flashed the headlights automatically every time you started the car, so you didn't have to.
If you have a newer one, you can just do the 07/06 bypass listed here:
get the bypass so you can watch DVD's
I should be able to watch DVDs with the headlight flicker trick correct? Or am I getting this trick confused with a different function?
I should be able to watch DVDs with the headlight flicker trick correct? Or am I getting this trick confused with a different function?
You can if your Z1 was made before Mid July, if it was made after you need to ground 2 wires to do the same thing.
Gotcha. How can I tell when it was made? Hopefully the guys doing my install are willing to do the extra step for me.
How can I tell when it was made?
The date, Month and Year (so far all 06's), is printed on stickers on the box, on the unit itself and I believe on the warranty card.
Well the headlight flicker didn't work. So I need to do the 06/07 bypass. I got the wrong ipod adaptor, so I have to take my car back to the shop to get that installed. When I take it back, I am going to take the write up on the bypass and have the install guy run me through it.