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Just installed these headers last week, so I figure ill update this thread.
First things first, its a real PITA to do by yourself in the garage, but yeah its do-able.
Main problem I had was the fitment of the rear O2 sensor. When I snugged the bolts on the header/testpipe flange the wires on the sensor hit the heat shield. Tightening the bolts made it worse. I had to take off the heat shield entirely to torque the bolts all the way..
Fitment with the stock resonator was off too. It lifts the resonator up and causes it to hit the heat shield and thus sounding like horse shit.
(Oh and you will need to buy two 3/8x16 bolts to thread into the test pipe. For some stupid reason they don't include them, and none of the stock bolts will thread in.)
I managed to tweak the exhaust for the time being to not hit anything, but I'm going to weld a new exhaust from the test pipe back to get things sorted permanently.
Check engine light came on after 50 miles (removed cats), I switched from 87 to 89 octane and the code cleared itself and has been off since.
As far as power gains, its all mid range and top end. 3rd defiantly pulls harder and it moves quicker through the 5-6k rpm range in all gears.
I can't comment on sound to much right now as the only thing muffling it is the one stock resonator. Much too loud when you step on it... Like stupid loud. Hilarious really. I should really make a video so you all can get a good laugh before I weld on the rest of the exhaust.