Question on Rarity

There are quite a few in the Philly area with a blue interior. One of my buddies has one. Why do you ask?
 
I am asking becuase someone told me that blue was a rare color. I have never seen another one with Blue Interior. Also how rare is a twilight sensor. Some guys with Grand Nationals pointed out that I had one and the didn't. Was is only avialible on the T-Types and not the GN. Last is what is the difference between concert sound II and regular. Thanks for all the help so far.
 
I think there are lots of white T cars with blue interiors. I've seen a few.

Anyway twilight sentinel is maybe one in 10 or one in 12 Turbo cars in my opinion.

My GN and my WE4 T model both have it. It is rare I would say. :)

The concert sound II is a six speaker system with 2 more in the door running on the front channels of the radio.

Regular is 4 speakers dash and rear.

So the concert sound would have different lower door panels.
 
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