Invidia Test Pipe Nissan 350Z 60mm (03-06) HS02N3ZTP2B Dual 60mm Test Pipe (Cat Delete) - Includes check engine light eliminator and bracket A test pipe, also known as a cat delete (catalytic delete pipe) is the least expensive way to add the most exhaust flow by removing the most restrictive area of your exhaust - the catalytic converter. Invidia has developed this high quality test pipe from ...