These guys provide a conversion to the Cummins 4bt, you get 420ft/lbs of torque but only 170HP.
If I was living near this shop and owned an old Wrangler, Maybe I would consider the upgrade (18K$

).
Keeping my fingers crossed, 2015 with a CRD 3.0L
http://www.vmmotori.it/en/01/00/01/dettaglio.jsp?id=9
More info on the 3.0L
"The 630T has the potential to make more than 600 hp in race trim. —Matt Trainham, Banks Powertrain Engineer"
"Banks & The 3.0L VM Motori V-6 engine
Since 1976 Gale Banks Engineering has been involved in building and supplying engines to the Military. During those 36 years every Gale Banks Military engine has had one dominant feature; they've all been turbocharged.
And because the Department of Defense is pushing our armed forces to use a single fuel (known as JP-8, which is very similar to diesel), Banks' current programs all revolve around diesel engines.
Banks' current military V-8 programs are based on the 6.6L Duramax long-block with with Banks external components and engine management. Higher power versions use Banks internal components as well. According to Banks, its defense customers use these engines in vehicles up to 30,000 pounds GCWR. Banks has also gotten back to its 6.2L/6.5L roots with a new power upgrade for 6.5L motivated AM General HMMWVs.
But for wheeled-vehicle applications used inrapid surgical strikes, a lightweight and high-speed diesel is required. That’s where the VM Motori engine from Italy comes in to play.
The guys at VM are located in the high-performance automotive equivalent of the Silicon Valley, with Lamborghini, Ferrari, and Ducati close by. The design of its V-6 is intended for firing pressures up to 2,940-psi, and the engine freely revs to 5,000 rpm. VM Motori has a passion for its engine designs, and according to Gale Banks it was, “
the excellence of this engine [which]convinced me that it would be a rugged basis for what I have in mind for these new Special Operations vehicles.”
Banks went on to say, “We had first fire in our engine test cells on Friday May 4th, 2012 and my first impression was about the sound...this thing is sweet! The low-end response is excellent and it revs freely, which worries me. We've already designed a high-rpm capable aluminum intake manifold for it but, our Banks AutoMind diesel engine controller is only good to 7,800 rpm in its current form.”
A Banks version of the 3.0L VM Motori V-6 engine will be also be available to the general public as well, according to Banks. “Our initial build will be 240 hp and close to 500 lb ft with an engine weight under 500 pounds,” reports Banks.
When asked what other applications we might see this engine in, Banks told us, “We have a stepped power development plan in the works and racing versions will emerge as well. I can't wait to put one of these things in my '06 Jeep Wrangler!”
"
http://www.dieselpowermag.com/tech/1208dp_banks_vm_motori_630t_v6_diesel_engine/
http://www.allpar.com/mopar/V6/VM-RA-diesel.html