TEGIWA Cat Back Exhaust System. This perfectly crafted cat back exhaust is made from the highest grade 304 stainless steel. The pipework features 70mm pipework from the manifold back. This is the same size as the collector on all headers so there is no 'step' to disturb airflow. The tailpipe increases to 87.5mm. The exhaust is ideal for those wanting to use their EP3 on track. The noise levels of this exhaust are within the limits for all UK tracks. If you daily drive your EP3 then this is the exhaust for you! The exhaust gives performance gains of around 5-6bhp over standard un-mapped, while reducing the vehicles kerb weight by around 1kg. Search 'TEGIWA' on YouTube to see in-car video's of this exhaust.