2003 GMC Sierra Ignition Boxes & Controllers
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PerTronix®Wire Harness and CapacitorGMC Sierra 4.8L / 5.3L / 6.0L / 6.6L / 8.1L 2003, Wire Harness and Capacitor by PerTronix®. From replacement wiring harness to adjustable vacuum advance canisters, lockout kits and mechanical advance kits, they have the parts to get...Digital performance solutions give you more power and more features in a smaller packageInnovative technology for superior operation and rugged dependability under harsh conditions$30.95 - MSD®HEI Ignition Control Quick Installation HarnessGMC Sierra 4.3L 2003, HEI Ignition Control Quick Installation Harness by MSD®. External Single Connector. Plug-In. MSD Ignition Controls are easy to install, but we also offer several direct plug-in Harnesses for late model vehicles!...Splice free installationPlugs directly into factory coil$59.95
- BD Diesel Performance®Toggle SwitchGMC Sierra 6.6L 2003, Toggle Switch by BD Diesel Performance®. Make your vehicle faster and more powerful with premium-quality performance fuel system parts stocked on their website. Manufactured using the highest grade materials and...Engineered to help enhance speed and fuel efficiencyDeveloped using innovative technology for outstanding performance$95.95 - $172.95
2003 GMC Sierra Models