Performance for 2002 grand jeep Cherokee 4 liter 6 cylinder?

Before people come and criticize i dont want a fast car, im just strengthing my cars performance.

So no turbos, or superchargers or junk like that. I also dont want to replace my engine.

So far i have:
-Performance Starter
-Performance Battery
- Performance Altenator
-Cold Air Intake

Also plan on putting on a after-market exhaust.

Are there any other modifications besides programmers, and computer chips, that i can upgrade for more performance from my engine?
 
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