Jeep inline 6 cylinder 4.0 190 hp. Because of emisions maybe your only option. If emisions isn't a concern, you could swap in a small ford, chrysler or chevy V-8 with an adapter kit. Check advance adapters.com for more info. Also avenger makes a super charger for the 2.5, takes the hp up to a round 200. Hesco was selling them.
1987 wrangler, 258 I-6, 5-speed.
2007 liberty sport 4X4, automatic
2009 ford ranger 4x4 FX4 OFF/ROAD, 5-speed