So, I am building an HPDE/Autox car for myself, and I am doing a quasi-STR build on an 06 NC.

I know that there is a fair amount locked up in the header for an NC, and am wondering which headers are good, especially from a cost/benefit perspective.

The Mazda Motorsports/Kooks Spec MX5 header is attractively priced, but I can't even find a picture. GWR MaxPower has good reviews, OFP decent, etc... I haven't had the greatest customer service experiences with GWR, so I'm somewhat reluctant to give them my money, but they haven't been so bad I won't try again.
The same is true of Vishnu, which colors the way I look at OFP.

Any recommendations? I have emails out to Fab9 and Dynotronics on tuning, as well as header choice, but haven't heard anything yet.