Modern-day turbocharged cars have downpipes with catalytic converters crafted-in. Makers try this to cut back dangerous emissions, exclusively NOx gases and microparticles. Nitrous-oxide gases are poisonous in enough quantity, although the particles frequently produce lung most cancers as well as other diseases. The emissions from a catless downpipe are atrocious. https://catlessdownpipe43197.wikirecognition.com/806243/fascination_about_downpipe