The 6.1 Hemi crate engine came complete from Chrysler. Burnsville fabricates the motor mounts and does everything needed to make the 6.1 run in the JK just like factory. Tony Squier supplied the wiring harness. A Griffin aluminum radiator sits under the factory trim piece and keeps the powerful mill running cool. All the JK systems work fine, including ABS, BTC, ESP, and the rest of the alphabet soup of systems in the Wrangler. It looks OE under the hood.