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I have began the insane process of removing the sound deadening tar from my interior. I am using a heat gun and a putty knife. How do I get the remaining layer of goop off so its clean metal? Any tips from the pros?

I have a 1993 honda prelude si w/ a h22a in it among other things. I have the jdm type S header that has an O2 plug on the 1 pipe section, before the flexpipe and cat. I heard there is a product that screws in where the o2 plug goes and sends the right fuel/air, no matter what the real reading...