Let's not muck up this thread anymore than we already have. The 4-2-1 headers when properly designed and built will make a much wider power band than a 4-1 with no downsides. There is so much to header design I don't know where to begin and I'm only at the tip of the iceberg.
As far as our 4-2-1's to chassis headers? There was no comparison. No comparison at all.
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