Modified LSX-powered trucks are all the rage these days, and with companies like FAST onboard with making the hardware guys (and gals) like us need, they’re more than happy to fill a niche that others might not be able to.
Enter their LSXRT injection molded intake manifold – it’s perfect for cathedral-port headed 4.8L, 5.3L and 6.0L GEN-III engines requiring increased airflow, maximum horsepower & torque, and the provisions for nitrous!
LSXRT Injection Molded Polymer Intake
Cathedral-Port Head Equipped Applications
Designed specifically for GM 4.8/5.3/6.0L cathedral port cylinder head-equipped truck engines and cathedral port LS1, -2, -6 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. Extensive testing led to a runner design that is longer and less restrictive and gives the user the ability to remove individual runners from the manifold 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 OEM electronic 78/90mm or aftermarket 90/92mm throttle bodies (three-bolt electronic throttle bodies require an adapter). Other features include integrated nitrous bungs and a precise bolt-on fit that permits the use of factory accessories and OEM fuel/emission connections without adjustments or clearance issues.
- 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
- 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
Rick Seitz is the owner and founder of GMEFI Magazine, and has a true love and passion for all vehicles. When he isn’t tuning, testing, or competing with the brand’s current crop of project vehicles, he’s busy tinkering and planning the next modifications for his own cars.