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If your talking about a 6.1 from Mopar, they do not come with a tensioner.

The Dayco has better tension vs the rest. When my company (High Horse Performance) installs superchargers on the SRT cars we only use Dayco tensioners because we have seen the factory, ACdelco, off brands, etc. literally explode. Unless your going the supercharger route you dont "need" it but we...