The Cherokee 4.0L is old school and responds well to the usual hot-rodding upgrades. Unless you have significant internal modifications, a 62mm Throttle Body is a waste of money. TB spacers are also a waste of money.
Start with a cat-back exhaust and a K&N type filter. If you like the results, have your stock Throttle Body bored out to 60mm. That should cost you about $75-100. Next, install a performance exhaust manifold.
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