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if you have an atx car, you can lay on top of the engine with the right socket wrench and get them out/in. It helps if you remove that little vacuum canister for the secondaries.
if you have a mtx car, you can do the above if you have little arms/hands. some guys need to r/r the intake to get to them.
Nope. I can change all my plugs and wires inside 20 minutes. The intake does not have to be removed for either. You need to remove the hose connected to the back of the intake and you will need to move the vacuum canister and remove the bracket that holds the vacuum canister. After that all you need is a very long extension. Its that simple.