Russell, as for the knock sensors I believe it is possible to remove them if you pull off the throttle body and use the right socket with a extension and a universal joint. I don't remember if you can replace that harness though with the intake still on. If you can't do it without removing the upper intake plenum, make sure you drain a bunch of coolant first before you pull the intake or you will end up with it in the heads. BTW, there's 2 knock sensors - one in each head.