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It exits right out the back through those somewhat restrictive trumpets. The exhaust is 2 1/2" all the way back until it hits the trumpet and then it drops to 2". I also opened up the vents on the trumpets a bit.
forgot to mention, I had to modify the trumpets by cutting them off halfway up and welding 2 1/2" pipe to them. However, inside the trumpet is a 2" pipe that had to stay.
by trumpets im guessing you mean mufflers? why did you have to modify them and weld a pipe to them?
The trumpets are the exhaust tips that were original to 65/66 Gt's. They would have been too restrictive with my set up so I had to modify them if I wanted to keep them, which I definitely wanted to keep them, at least for now.