Reds Racing is enthusiastic to introduce an important evolution within its high-end off-road nitro engine lineup. As part of this development, Reds Racing unveils a brand-new engine family called the X Line , which will run alongside the current flagship 721 Superveloce Gen5 – S Line Version 2026 . The new X Line debuts with the 321 ESTREMO™ , a 3-port engine designed to offer a different driving character compared to the well-known 721 S Line platform. The 721 S Line  will c