Here is THE 3.4L Doug Thorley headers thread. This will be thread for all questions and answers regarding these headers. They are full stainless steel construction, mandrel bent, laser cut flanges, and will be offered in chrome or ceramic coating. The following are the dyno charts from my truck, 240hp being baseline, and 256hp after headers. You will see the modifications in my profile. The headers are 1.5" primaries, 2.5" crossover with a one piece crossover. I will have pictures up shortly. And all other details will be coming soon!! Enjoy!!
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