Free shipping within the USA* on all orders $99 & up!!

Fast LS3 LSXRT High HP Runner 102mm Intake Manifold

$1,249.95 $1,201.95

Brand Fast
SKU: 146105B
High HP intake runners from FAST® are now available in a complete all-out race manifold package. Building upon the popular LSXR™ intake manifold, this LSXRT™ version gives LS3 engines with rectangle-port cylinder heads even more plenum volume for all-out racing. Best suited for high-RPM race engines, this manifold creates proven gains of 30+ horsepower over the FAST® LS3 Street Manifold at high RPM. The raised 102mm throttle body location optimizes the larger, less restrictive High HP runner design, creating more power. It also clears truck drive accessories.

FAST® engineers teamed up with airflow specialists at RHS® to develop polymer intake manifolds for GM LS based engines. Testing on a near stock LS7 engine with a Big Mouth 102mm Throttle Body™ produced gains of 16+ horsepower, and 26+ rear wheel horsepower on a 500c.i. engine. The LSXR™ 102mm Intake Manifold features a revolutionary modular design that allows fast and easy disassembly and features the ability to remove individual runners for porting.

Constructed from the same advanced polymer material as the original FAST® LSX™ 92mm Intake Manifold, the LSXR™ offers a host of benefits over aluminum aftermarket intakes, including lighter weight, increased strength and improved heat dissipating characteristics. While the LSXR™ features a 102mm air inlet that is perfectly suited to the FAST® Big Mouth 102mm Throttle Body™. Other features include integrated nitrous bungs and perfect bolt-on fitment that allows the use of factory accessories without modification or clearance concerns.


  • '08-'13 Corvette
  • '06-'13 Corvette Z06
  • '10-'14 Camaro w/ 6.2L
  • '14 Chevrolet SS
  • '09 Pontiac G8 GXP
  • '08-'09 Pontiac G8 GT
  • '95 & Older w/ Retro-Fit GM E-Rod 6.2L


  • FAST® Big Mouth Throttle Body (Drive-by-Cable)
  • OEM/Stock 4-Bolt* Throttle Body (Drive-by-Wire) FUEL RAIL OPTIONS
  • FAST™ Anodized Billet Fuel Rail Kit
  • OEM/Stock Fuel Rails w/ FAST™ Adapter Kit

*Can also be used with OEM 3-bolt throttle bodies (in applications where rectangle port heads have been retro-fitted) with FAST™ Adapter Plate.

You might also like