turn0product1 Traxxas Air Filter Inserts Foam 3 (5261) are a set of three pre‑oiled foam air filter inserts designed to trap dirt and debris and protect the engine on nitro‑powered Traxxas vehicles equipped with TRX 2.5, 2.5R, and 3.3 engines; these foam inserts install into the air filter housing to help maintain clean airflow for reliable performance and longer engine life in models such as Jato, T‑Maxx, Nitro Rustler, Slayer Pro 4×4, and similar nitro trucks.