Why does my exaust manifold keep cracking on 1997 Nissan Pickup (D21)

Replaced cracked manifold and it cracked again after 1 month.

Asked by for the 1997 Nissan Pickup (D21)
Extreme cold weather and hot exhaust don't mix but Napa has a repair kit
Muffler & Exhaust Sealer & Repair Kit, Cracked & Broken Exhaust Manifolds, Headers & Furnaces
Product Line: Balkamp
Part Number: BK 26346
$10 at