Hi Dan, some folks say that the crossover provides increased efficiency, other deny that. There are a lot of opinions also here in gt40s. I looked at different exhaust types before I started, and my benchmark is shown in the attachment. By the way, it was really exciting and fun to work on it, and straightforward tubes as in your GTD are unachieveable for me, working with standard bent tubes (I used 15, 30, 45, 60 and 90 degree pre-bend stainless).
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