Through body exhaust.
Where did you get the fins @retro-bird ?
Here's a link to this photo. Just copy and paste!
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[URL=https://forums.fordthunderbirdforum.com/thunderbird-photos/photos/960/]960[/URL] by [URL=https://forums.fordthunderbirdforum.com/thunderbird-photos/authors/retro-bird.7877/]retro-bird[/URL] on Ford Thunderbird forum covering all models 1955-2005