Upgrade Your Jeep 4.0L with Rebuilt Bosch 4-Hole Fuel Injectors

Sick of the sluggish performance from your stock Siemens single-hole injectors? Upgrade your 1999–2006 Jeep 4.0L engine with a professionally rebuilt set of Bosch 4-hole fuel injectors—the most trusted upgrade in the Jeep community.

• ✔️ Better fuel atomization = smoother idle and improved MPG
• ✔️ More responsive throttle and stronger low-end torque
• ✔️ 100% plug-and-play installation – no tuning, no splicing
• ✔️ Flow matched to within 2% using industry-leading ASNU testing
• ✔️ Lifetime replacement warranty included

Whether you're daily driving or running bolt-on mods like intakes, headers, or a mild cam—this injector upgrade delivers real-world improvements you can feel.

Jeep 4.0L Vehicles These Injectors Fit (1999–2006):

• Jeep Cherokee XJ
• Jeep Wrangler TJ
• Jeep Grand Cherokee WJ
• All Jeep 4.0L inline-six engines in this year range

Each injector is inspected, ultrasonically cleaned, spray pattern verified, and flow matched before being packaged and shipped. We include brand-new orings, filters, and retainers so they're ready for a clean install right out of the box.

Stop wasting fuel with outdated single-hole injectors. Upgrade to genuine Bosch 4-hole injectors.

Internal upgrade chosen for best performance—no visible part numbers listed. These are authentic Bosch cores, rebuilt and flow-matched for Jeep use.

✔️ Lifetime Warranty | Fast Shipping | No-Hassle Returns