RDP Plenum Reinforcing Inserts™ 94 - Early 99

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RDP Plenum Reinforcing Inserts™ - Ford 7.3L 94-Early 99

These billet 7075 Aluminum plenum inserts are a Riffraff Diesel original design and are patent pending. They are made to allow you to clamp down as hard as needed with T-bolt clamps so that you don't have any boost leaks. Fix your bent and crushed stock plenums with our Inserts as well. This is a budget friendly option to buying full billet plenums. Easy install, no special tools needed.

These were designed so as to add the least restriction possible while providing more than adequate structure for clamping. The Plenum Inserts have been machined to within .164" of the OEM diameter so there will not be any measurable affect on EGT's or cfm flow.

These are sold in a pair.

Riffraff Diesel Performance is committed to 100% Made in the USA on this product. All materials are from USA resources. Every machining step is performed in the USA. Every component is assembled in the USA.


1994-Early 1999 E, F Series, and Excursion Powerstrokes
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  • 5
    Great invention

    Posted by Steven Schutte on Jun 23rd 2023

    I am really happy with these and glad I got them.

  • 5

    Posted by Ryne Hughey on Mar 7th 2023

    Works great, easy install. Good addition to stock plenum.

  • 5
    RDP Plenum reinforcing inserts

    Posted by Dan on Mar 7th 2023

    work great , quick work around for stock plenums

  • 5
    Quality Product

    Posted by Jake on Nov 15th 2022

    These are a must for your truck. Fixes a known issue of the weak stock tin plenums.

  • 5
    rdp plenum inserts

    Posted by Billy on Aug 22nd 2022

    a must if you want to pull with your rig,keeps charge tube from always blowing off under hi boost.

  • 5
    Plenum Reinforcing Ring

    Posted by Jeff Martinez on Jul 16th 2022

    The plenum reinforcing rings are just what I needed. Just removed, rebuilt and replaced the turbo on a '97 F-350. I installed the reinforcing rings and brand new Riffraff boots to ensure another 25 years of reliable service. I don't pull ridiculous boost or I probably would have opted for the new plenums. Super easy install. Slip fit and a few taps with a piece of 2x4.
    These reinforcing rings are just the ticket.

  • 5
    Great quality

    Posted by Jesse Pritchard on May 23rd 2022

    Bought these for when I was installing a intercooler system for my truck. My passenger side plenum wasn’t in the best shape, or the roundest shape. Installed these and they straightened it right out and gives it added strength for better clamping. Definitely worth it!

  • 5
    Quality part

    Posted by Chris on May 11th 2022

    Figured I might as well make the engine as good and efficient as possible. They seem like quality parts and I haven’t had a problem.

  • 5
    Plenum inserts

    Posted by John davis on May 1st 2022

    They fit well and do exactly what they are supposed to do but my plenums leak at the heads so I will order new plenums when they are in stock