get dt long tube headers?

I'm not familiar with any other's state's visual inspection but here in California, they also open up the hood to check your smog connections. Headers without a sticker will never pass visual even though it turns out clean with the rolling and sniffer test.

 

Has anyone noted the performance gain with the DT headers? How much extra horsepower and/or torque.

 

I am in for a group buy too.

 

I don't know what the exact numbers but the power gains are through out the rpm range.

 

No losses in the low rpms vs the shorties?