2 Brothers Racing

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Part number 146602

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Designed specifically for GM 4.8/5.3/6.0L cathedral port truck engines and cathedral port LS1/LS2/LS6 race applications where hood clearance is not a concern, the FAST™ LSXRT™102mm Intake Manifold follows the path chartered by the original FAST™ LSX™ Gen III Intake by featuring a modular design that allows for easy porting and disassembly and a runner design that yields an incredible 25 peak horsepower gain over the stock intake, on a stock 6.0L engine with a Big Mouth 102mm Throttle Body™. And similar to the LSXR™ 102mm Intake Manifold for cars, the LSXRT™ features the ability to remove individual runners for modification.


The LSXRT™ is constructed from a proprietary precision injection molded polymer which offers many benefits, including lighter weight, greater strength and lower heat soak propensity. While it features a 102mm air inlet that was designed for the FAST™ Big Mouth 102mm Throttle Body™, it can also be used with stock 90mm or aftermarket 92mm throttle bodies (78mm three-bolt throttle bodies require an adapter). Other features include integrated nitrous bungs and precise bolt-on fit that permits the use of factory accessories and OEM fuel/emission connections without adjustments or clearance issues. Some GM truck models may require the FAST™ 92mm or 102mm throttle body. 


*Includes intake gaskets

25 HP Gain When Used w/ 102mm Big Mouth Throttle Body™ On A Stock 6.0L Truck Engine

  • Constructed From Proprietary Precision Injection Molded Polymer - Lighter Than Aluminum w/ Lower Heat Soak Propensity & Greater Strength Over Stock Molded Intake
  • Can Be Used w/ OEM Or Aftermarket 4-Bolt 78-92mm Throttle Bodies (3-Bolt Throttle Bodies Require An Adapter)

  • Innovative Multi-Layer Design w/ Removable Runners For Quick & Easy Disassembly & Porting

  • Integrated Nitrous Bungs; Plug-And-Play w/ ZEX™ LSX™ Direct Port Nitrous System

  • For '99-'14 4.8L/5.3L & '00-'07 6.0L Cathedral Port Head Equipped Engines1