2017-2023 L5P Duramax S400 Turbo Kit

After YEARS of testing we are happy to offer the FKF L5P S400 kit

Every component was designed and engineered in house. This includes our billet pedestal and Y bridge. ZERO overseas manufactured components 

Key features-

Billet Turbo pedestal- CNC Machined from a brick of steel for years of crack free use which is a well known failure point in other L5P S400 kits. Pedestal has a 45mm wastegate provision and 2" Up Pipe inlets. Making it a port match to all aftermarket 2" up pipes. Kit includes a wastegate cap to block off the pedestal if not utilizing a gate

5" 6061 Aluminum Intake- True 5" mandrel bent intake TIG welded for aesthetic and strong welds. Billet MAF bung with correct placement for easy MAF scaling which has been tested through all the big L5P tuning names. No need to choke your S400 and drop to a 4" intake.  Fabricated Ram Air airbox for the 17-19 kit included to get the most out of your L5P. Largest airbox/filter combination available on the market fitting an 11” long filter and will fit an 11" power driven or IDI filter

3" 6061 Aluminum Y bridge- Full Mandrel Bent 3" tubing to both intake runners which immediately jumps to 3.5" at the split. There is not a section in the cold side of this kit that sees less then 3.5" tubing. Integrated billet MAP bung and 2-1/8 NPT ports for monitoring or other power making activities. Port Matched Billet Intake flanges make for a smooth transition into the head

3.5" cold side tubing- 3.5" mandrel bent cold side tubing with integrated IAT bungs. Includes Billet Intercooler adapter that has proven to hold 80+psi and works with most aftermarket intercoolers

3" 2 Piece hot side pipe- 2 Piece design for ease of install. Integrated NPT ports for pre Intercooled charge system monitoring

3.5" Stainless Steel downpipe- Full Mandrel bent TIG welded Stainless Steel 3.5" Downpipe. Port Matched Flange and tubing size has been proven to make 1000+hp without becoming a restriction. Slides up through fender well, no cutting or cab removal required

Misc. components-

All Couplers and boots included- We use ONLY multi layer 4 ply reinforced Aramid fiber constructed boots and stainless steel clamps. Unlike other couplers, you won't be fighting blowing pipes off and pulling out the hairspray when your truck makes full boost

Oil Feed and Drain Lines- Includes all required plugs and fittings to have a reliable and well thought out oiling system. The only kit on the market that offers a -12AN drain line meaning there is zero restriction getting oil out of the turbo

Coolant plugs- Includes the required billet coolant plate to plug the VGT feed directly at the source. Also includes the required heater lines to properly re route the coolant lines without making a run to the hardware store in the middle of your install

2020-2023 trucks

 No more cutting up your turbo kit and repining plugs to S400 swap your truck. Our 20-23 kit is a direct bolt up for these trucks and requires no modifications

2024+ trucks

The 20-23 kit will bolt up to 24+ L5Ps with minor modifications

-Adding a MAP Bung (let us know in the cart notes and we can send a 2nd MAP bung)

- The 24+ trucks have a different style VGT plug which would require pinning this sensor or utilizing the actuator to fool the VGT system

Why choose FKF? We developed this kit in early 2024 and since have 20+ kits on the street and track. As with any new product we worked through every kink possible for a daily driver and at 1000+hp and now feel 100% confident to release this kit. We also offer complete customizability with powder coat combinations and coat the compressor cover for free with the purchase of a kit! Current lead time for this kit is 3-6 weeks from time of order. We know this is quite a long wait time but this is not a mass produced turbo kit. Every kit is built and welded by the same 2 people at FKF and undergoes a rigorous QC process. We promise and guarantee these kits are worth the wait time

Turbo Sizing Options

S467 83x74 .9ar- This is the smallest turbo we will recommend for the L5P. The L5P boasts a strong stock fuel system and this turbo has made 700+hp on stock fuel combined with our kit and proper tuning multiple times. This turbo still retains good drivability and is best combined with stock fuel and up to 100% injectors/12mm pump. Max 800hp

S472 87x82 1.0ar- This turbo is best suited with fueling and trans upgrades. Pairs well with 100s/12mm. Still works well on the street but has a higher HP threshold. Max 1000+hp

S476 87x82 1.0ar- This turbo is more performance forward and requires large injectors and pump combinations. Intercooler/converter mods recommended. Max 1200+hp

S480 96x88 1.25ar- This is a strictly performance turbo. 200%/14mm fuel system and supporting mods recommended. 1300+hp

Kit will bolt up to VS Racing/Pulsar style turbos with the removal of the downpipe flange centering ring. If you let us know prior to ordering we can modify to fit your VS turbo 

If custom powder coat colour is desired- Select “Custom Colour” and state colour in the cart notes

Color Link- https://www.prismaticpowders.com/

Being Built to Order these kits are final sale