factory fitted xenons

I'm looking to purchase a z4 convertible 3.0si and want to know how good are the factory fitted xenons. I have a focus with xenons which give amazing light output. I couldn't go back to halogens! therefore xenons are must when searching for a z4

If the xenons are pants, is there any way of improving the factory fitted xenons or upgrading them

What do you guys suggest, your thoughts would be appreciated

Cheers
 
It's 10 year old technology so I assume they're standard xenons.

Had bi-xenons on a focus st which appear to be miles ahead of the Z4's xenons.
 
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