The factory 7.3 Powerstroke intake plenums are thin stamped metal, and the intake mouths can bend from clamp pressure. Once that happens, the truck can develop boost leaks at the boots or plenum seal—especially on higher-boost trucks with tuning, injectors, or turbo upgrades.

The Riffraff Diesel Billet Intake Manifold Plenum Set (RDPBLTPLNM) replaces the stock sheet metal plenums with a pair of 6061 billet aluminum plenums built for better sealing, better boot retention, better air flow and a cleaner long-term install.

Check them out: https://www.riffraffdiesel.com/riffraff-diesel-billet-intake-manifold-plenums-1994-2003/

 

Why upgrade over stock?

The billet design eliminates the “bending sheet metal” problem and adds a larger intake mouth for better flow than stock. The mouth OD is also machined to help retain the intake “Y” better, especially on T4-style turbo setups.

Riffraff also uses a Viton O-ring seal instead of RTV, tested at over 150 psi, so the plenum seal is cleaner and more serviceable than a typical RTV-only setup.

 

Key features

• Pair of 6061 billet aluminum plenums
• 100% Made in the USA from USA materials
• Larger intake mouth for better flow than stock
• Fits popular stock pedestal-mount and T4 turbo setups
• Works with stock and modified turbos
• Commonized for 8-bolt and 10-bolt cylinder heads
• Viton O-ring seal instead of RTV
• Stainless mounting hardware
• Works with single and dual HPOP setups
• Billet spacers for GPR/GPCM brackets
• Color anodizing options available

 

Fitment notes

Factory 1994–early 1999 trucks use 2" plenums, while late 1999–2003 trucks use 3" plenums. Riffraff offers both inlet sizes, along with vehicle-year options for 94–early ’99 and late ’99–’03 applications.

Some early OBS fuel line adapters may interfere with the plenums.

On 1999–2003 trucks, Riffraff suggests the Fuel Feed Line SS Braided Hose Kit in place of the stock fuel lines.

 

Install

Remove the intake boots and factory plenums, clean the cylinder head sealing surfaces, install the Viton O-rings, set the billet plenums in place, tighten the supplied stainless hardware evenly, reinstall the intake boots (we highly recomend upgrading to silicone boots), then pressure-test and check for boost leaks.

Care note: anodized aluminum can be damaged by harsh chemical engine cleaners. Use soap and water only.

 

Bottom line

If you’re searching for 7.3 Powerstroke billet intake plenums, 7.3 intake plenum boost leak fix, or 1994–2003 7.3 plenum upgrade, this is the do-it-once solution for better sealing, stronger boot retention, and a cleaner intake setup.