^^ Above is a pic of my removed stock exhaust manifold when I was installing my new Pacesetter headers. To give an idea of how restrictive the stock manifold was, I put my watch head up next to the exit port as a good visual aide. My watch head is about an inch and a quarter wide. So by how it looks, the hole was less than 2 inches wide. So the 3 inch collecter on the Pacesetters were definitely a huge help. They've kept the engine heat down too so I'm helping the car out in the long run at the same time.
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