[Doug at RSI]

That would be a correct conclusion; I haven't dyno tested these headers myself. As a consumer I generally trust unbiased customer opinions versus shops pushing product.

In my opinion a random guy with great results is a much better way to get an actual real world 100% genuine review of the product at hand. Getting the power from these engines isn't that hard in peak horsepower dyno terms. Its keeping the check engine light off that gets tricky and Belanger is the only company that has achieved this at this time (to my knowledge). Ask people that have given the various headers a shot and see what their candid responses are.