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199 Posts
rattle, when warmed up, is telling you that BMEP (cylinder pressure) at TDC is climbing very high. Overtiming. It is stressful and costly over time, and not worth the extra 1/2 mpg. There have been products rushed to market. i would err on caution, and settle for the tune that doesn't rattle, all else being the same. Leave rattle for those who can monitor the timing changes. That's my opinion.
