1. brand AMR
2. EL Race headers
3. 2 bolt with own UP gasket provided, it bolts with stock UP, in my case it bolts with the Crawford 35R kit UP
4. AMR's own gasket
7. equal lenght
9. it clears my moroso oil pan
10. I don't know the thickness, i wish it was a bit thicker
11. installation is very difficult compared to oem exhaust manifold. performance is laggy but nice, my engine never run smoother than AMR EL Race headers installed .
12. weakness would be the POS UP gasket that came with it
, the gasket blew up on me without really pushing my engine hard. that gasket is nowhere near the performance and durability of oem or grimmspeed gaskets.