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

    Posted by CJ on Oct 6th 2021

    These fit great and really strengthen your plenums. I use them on my sled pull truck and they help a lot. worth the money its a must have

  • 4
    Intake plenum

    Posted by ML on Aug 4th 2021

    Snug fit, had to use a hammer to tap in. Hope I never need to remove.

  • 5
    Plenum inserts

    Posted by Bill on Jun 6th 2021

    They were very easy to install and made clamping much stronger

  • 5

    Posted by Unknown on Mar 26th 2021

    Great quality fit well. Thank you Riffraff!

  • 5
    Intake inserts E99

    Posted by Unknown on Mar 10th 2021

    Good cheap upgrade !!

  • 5
    Reinforcement ring

    Posted by Chuck on Feb 24th 2021

    Very well made. Took care of one of my collapsed intake ports. Installed very well, very happy.

  • 5
    Plenum inserts

    Posted by Robert Overton on Feb 17th 2021

    They work great

  • 5
    Plenum inserts

    Posted by Andrew on Feb 9th 2021

    Very strong inserts. Very easy to slip on and well made.

  • 5
    Another awesome part

    Posted by Dean M on Jan 16th 2021

    I honestly am still waiting to upgrade to the 3" plenums from this site but this should keep me happy in the meantime. I already have a Banks intercooler and a few other mods on my 7.3 powerstroke. I didn't think these would do much for me at first, but after I had them installed I did notice an extra pound or two of boost and it felt a little more responsive. So apparently my intake plenums were leaking a bit and not allowing full boost and now they are and I did notice a bit of difference. I would absolutely recommend these for fixing the cheap tin plenums you may be surprised at the results from such a small part.