FAPO Shorty Headers for 08-13 Chevy Silverado GMC Sierra 1500 5.3L V8 1-3/4 Primary 409SS FE640170Application: Compatible with 2008 2013 Chevrolet Silverado 1500 with 5. 3L V8 2008 2013 GMC Sierra Sierra 1500 with 5. 3L V8 GM Small Block Gen III IV (LS Based) Engine Features: OE style ball socket collector connects to factory exhaust head pipe Mitered merge collectors to maximize exhaust velocity and scavenging Excellent quality and durability to improve vehicle performance Shorty design for power gain from idle to mid range RPM Fully mandrel bent