I was searching on google for headers and found a site called partsamerica.com and they had a flowtech header for special ordering for the sc400... then i did more research on type of headers and flowtech has the shorty smogs and so on, still wondering which one partsamerica was probably referring to. anyways i was just wondering if anyone heard of these?

 

also after researching about the headers and how the last exhaust port is a 90 degree angle into the exhaust log, i was wondering if the improvement that was said by others was simply to change this last port so that it flows more easily or is there more to improve than just that?