What is straight pipe?

A straight pipe is an exhaust system that does not feature any mufflers or silencers. It is a term used to describe the modification of the exhaust system in which the catalytic converter and mufflers are removed, and the exhaust gases are allowed to flow straight through the exhaust system. This type of exhaust system typically results in an increase in power and performance, but it also leads to an increase in the volume of the engine noise. Straight pipes are often used in racing applications where performance is of the utmost importance, but they are not recommended for road use due to their increased noise levels and potential legal issues. Additionally, removing the catalytic converter in most cases is illegal in most countries, as it can result in higher emissions.