The 4 Banger is the same engine family as the Neon, etc. You could theoretically swap in an SRT-4 engine, however that would NOT be cost effective. It would, however, be extremely powerful.

Other options are Cold Air Intake, Header and exhaust, MSD makes a selection of coils and wires for that engine, not specifically the KJ.

As for forced induction, to do it right, would certainly break the bank and then some.

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In an epic quest for the perfect Diesel Liberty.
2002 Land Rover Discovery 2 SE

What transmission does the 4 cylinder have? I don't know if it could handle the srt-4.

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June 2001 Liberty Limited 4X4
Frankenlift II Premium, Al's Upper Arms, 245/75R16 C Silent Armors on Moabs, RL Skink Super Sliders, Rear DTT, Riddler Diff Cover, Fastman Throttle Body, Profinish-Proglass Hood, Borla Dual Outlet Exhaust, TransGo Reprogramming Kit, APS Stall Converter, 4.10 Gears, B&G Chrysler PCM, Lots of Line-X, etc...