The header itself is beautiful. Top notch materials, construction, and welding. Excellent fabrication coming out of JDL. The sound is incredible and really provided that deep boxer rumble I was looking for. Performance paired with a stage 2 UEL tune from OFT is perfect, and provides noticable hp / tq gains, and completely eliminates the FA torque dip. Only fitment issue I ran into is the header coming in contact with the metal splash shield underneath, you may have to dimple the shield with a hammer in the spot that it rubs.
The hardware and gaskets for the overpipe however leave something to be desired. I couldn't get the gasket to seal up with the stock overpipe, so I'm currently battling a leak there. Also, the bolts are too long, and come in contact with the thin metal gasket on the lower O2 sensor. It will bend it out of the way. The bolts can only go in one way, there is no room to put them in from the header side unless you put them in before installing the O2 sensor. It's extremely difficult to tighten the top bolt / nut on the overpipe connection with hardware of that size. Hopefully they ship some revised overpipe hardware for future customers.