TEGIWA Cat Back Exhaust System. This perfectly crafted cat back exhaust is made from the highest grade 304 stainless steel. The pipework features 60.5mm pipework from the manifold back. 60.5mm is the same size as the collector on all headers (Toda/Tegiwa) so there is no 'step' to disturb airflow. The tailpipe reduces to 52mm in order to keep sound levels low enough for trackdays and is within the limits for all UK tracks. If you daily drive your FN2 then this is the exhaust for you! The exhaust gives performance gains of around 3-4bhp over standard un-mapped, whilst also reducing the vehicles kerb weight by around 6kg. Search 'TEGIWA' on YouTube to see in-car video's of this exhaust.