Introducing the Billet Side Caps for the POPULAR Plenum, we all know that these plenum's side caps originally would tend to crack under pressure. The original plenums came with either hard plastic or carbon fiber side caps, both would eventually crack over time as mentioned by many of whom owned these plenums. We decided to bring out replacement strong billet side caps with replacement hardware that would last years or even decades. Only limited number of replacements were made to the rarity of these plenums. What you will receive: - 1 Pair of Billet Anodized Black Side Caps (Request for other colors) - All hardware for the side caps *Manifold Plenum not included