Trial headers are also 800$. The BFD and AMSS are $350 and $400, respectively. I wrote BFD and they claimd around 8 or 9 hp to the wheels, but couldn't verify it. From what I've seen with the TRD
headers you lose a lot of midrange power and gain about 2 up top. I would LOVE to see some dyno data on any headers at all, because if the Trial are 800 dollars I wouldn't drop that money on something that makes me lose low and mid end power (where I do the majority of my driving) just to gain 11 horsepower at 7800 RPM (which, while I do hit as often as humanly possible, isn't that practical in a big city).