Jimbo,
The K&N system offered by Revel (K&N Part# 57-1515-1) is for the naturally aspirated PT. That is why it will not work with the 2003 GT (or 2004 GT or 2004 Turbo Lites).
You need K&N Part# 57-1531 to fit the turbo motors.
Hope this helps!
Scott
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