I got the injector cover from my brother who works a for a Jeep dealer here in St. Louis, it definitely helps clean it up.
I have no idea why a Magnum cover or a 1.6L cover is so cheap compared to a 2.0L cover.
Here are the part numbers:
1.6L 16 Valve injector cover: 4891522AB $11.77
2.0L High Output injector cover: 4891410AB $14.43
2.0L 16 Valve injector cover: 4891356AB $37.89
Fuel Rail Bolts each (2 needed) 6505873AA $4.23
You can also try these guys out.
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