Aluminium good for keeping down the heat a little as 3.6 known to run a tad bit hot.
But aluminium ones can be prone to cracking and not last as long. Could buy a second generation (V2) mishimoto but more costly than alternatives.
Me personally, I’d just go a stock oem equivalent.
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Jeep TJ rebuilt 4.0L, Custom Steel Roof Racks, vintage ((Jeep specific)) 15” Centerline Hellcats,
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