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Flowtech Long Tube Header - Black Paint

1999-06 Chevy/GMC 1500 Truck V8-4.8L/5.3L 2WD Long Tube Header with Y-Pipe, 1-3/4" Primaries, 3" Collector and Y-Pipe, Black Paint

PART# 11533FLT

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Flowtech Headers are the perfect combination of quality and value. This long tube header with high flow Y-pipe fits the popular 1999-2006 Chevy Silverado/GMC Sierra 1500 V8-4.8L/5.3L 2WD.


  • High flow, mandrel-bent tubes provide consistent tubing diameters for smooth flow and increased exhaust velocity
  • Heavy duty tubing and high quality welds for increased strength and durability
  • Smooth transition, 1-3/4” diameter primary tubes are used for increased exhaust flow increasing performance, improving throttle response and broadening the torque curve
  • 3” slip-on collectors connect to a 3” high flow Y-pipe that connects at the factory exhaust location
  • TIG-welded, machined 3/8” header flange for a leak-free seal and maximum strength
  • Premium aluminum header gaskets and installation hardware included
  • Available in a high heat resistant black paint or a satin silver metallic ceramic thermal barrier coating
  • Connections for O2 sensors are located on collectors. Catalytic converter must be relocated
  • Headers are a must if you are using a cold air intake, cat-back exhaust system or tuner


Collector Diameter3.00 inch
Emission Code4
EngineGM LS
Header FinishBlack Paint
Header StyleLong Tube
Primary Tube Dia.1-3/4 inch
Product TypeHeaders
Tube MaterialMild Steel
Part Number11533FLT

Service Parts



This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Tech Resources

Does not fit four wheel drive vehicles


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