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What is V4X RPO code?

1248 Views 1 Reply 2 Participants Last post by  ECha3, 
I
I was looking at my RPO codes and came across V4X.
When looking at the .pdf it is listed as:
Model Conversion - STSI

Anyone know what that is, or do all STS models have that?
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ECha3
2006 & 2007 Descriptions = 'V4X - STS CONVERSION V8'
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