High-flow air filters or open intakes (for example K&N-style filters) increase airflow for a small performance gain and a throatier intake note. Legal note: Generally a bolt-in accessory that does not change RC particulars, so it is usually treated as legal under Section 52, but it can lean out the fuelling and increase emissions. Pair it with a correct fuel adjustment and keep the bike within BS VI emission limits, or it can fail a PUC/fitness check. Not a structural alteration; no RTO approval normally required. Read more
