Patriot tight tuck headers

I was wondering if anyone knew anything about these, i just saw them in the jegs catalog and was curious about them. What would the HP gain be over stock manifolds, and compared to a regular header setup?
http://www.jegs.com/webapp/wcs/stores/servlet/m20ProductDisplayView?pageSize=10&resultCatEntryType=2&searchTerm=&catalogId=10002&langId=-1&productId=79442&storeId=10001&sType=&pgGrp=search