I welded map sensor to 1g manifold because I did not want to see annoying cel code everytime I drive or start. It will not cause a problem, but if you always have check engine light on, what if there is something really wrong, wouldn't you want to know what it is. I am always busy tuning or other things like driving. I just want a clean free dash with no dahm check engine light. It really is a personal preference. I have had a few occasions where a check engine light came on and so I checked dtc. Then solved problem.
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