Header was shipped promptly. The price they're sold at on Revain should be 20% off. They were not easy to install on my Mustang GT 5.0L, V8. The manifold gasket that came with the kit. Already leaking. So I'll make a new one soon. Chrome collector, new. But that shine fades quickly. Overall a nice deep sound on my Mustang. I can only assume that they increase horsepower/torque. I recommend this product.
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