On my NA I had to remove the air intake past the throttle body. Then the fuel lines cold start injector a couple of water hoses, I think the ISC valve and then a couple of bolts for the fuel rail. Then the whole thing pulled out. There are o rings in the rail and down where they seat in the head. Be careful about getting any dirt in the injector holes and you might want to blow the area out before hand with some LP air.
I would recommend getting the rings from the company, there are 3 different ones per injector and you might want to check on the other gaskets scince you have to take off the intake piping.
Its not that difficult of a job and you can clean the injecors while they are out.
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