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FWIW, I installed the OHC mod last weekend. In the process, I had the battery disconnected for maybe an hour or so. I swear I have more low end power since then, but that could be the weather being colder and more dense air.
I put a volant cold air intake and flowmaster exhaust on my 3.0L and I could tell a difference in power afterwards...but now im waiting till my engine goes, then I'm dropping a crate 5.0L in it!