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Did you ever find anything out about the GTC300, I reached out a few different times in the last couple weeks about the exact same thing and convo has gone cold with APR?Here is the instruction for the S550 GT-250 install that APR sent me. You can see they put an aluminum plate inside part of the trunk as well as the carbon plates that are visible. I have a couple more questions out to them. I think one of their off the shelf GTC wings will match up to the S550 trunk mounts. Then just some pedestals to make it work.View attachment 5226
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