...914-6 GT Rally Exhaust System. I personally took these photos of a GT factory muffler belonging to Harry who was nice enough to meet with me. Thanks again Harry!
Original 914-6 GT Rally Muffler
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Exhaust Outlet Tip of a an Original 914-6 GT Rally Muffler
Exhaust Inlet Tip of a an Original 914-6 GT Rally Muffler
Exhaust Inlet Tip of a an Original 914-6 GT Rally Muffler