What do you think about this header:

What do you think of this header? What kind of power gains will it give me? I want something that will give me low and mid range tourqe. Am I looking at the wrong header?

http://www.jdmshit.com/ITRssheader/

JSR (JDMsh!t Racing) B-series 4-1 SS Header * NEW *
* Exact Replica to Mugen 4-1 Header
* 2.5" Collector Size (Need 2.5" Cat Converter)
* Polished Stainless Steel
* Thick Flanges
* High Quality Welds

$199 shipped