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Originally Posted by eclou
Exactly. 2 big questions marks for me:
1)upgrading the exhaust headers and piping but retaining the stock cats and muffler = probably net gain of zero
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Perhaps he retained the stock cats because he needs it to pass emissions. And he used a factory muffler because he didn't want something real loud. He probably only swapped out the headers because the exhaust ports on the 3.4L heads are too big for 2.5L manifolds and the bolt locations may be different as well. Is that right Jaay?