MK5 Golf GTI

All Things Mk5 => Modifications & Technical Area => Technical Workshop => Topic started by: GSP1973 on September 26, 2015, 08:30:30 pm

Title: Cat Back Exhaust
Post by: GSP1973 on September 26, 2015, 08:30:30 pm

Sorry about my ignorance. But can anyone explain the workings of a cat back exhaust / de cat exhaust. :notwise


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Title: Re: Cat Back Exhaust
Post by: dronners on September 30, 2015, 11:21:01 pm

its a piece of pipe with boxes in it containing either a sound absorbing material or chambers to reduce the noise.  in regards to the cats/decat its either another "box"  containing materials laced with precious metals that react with harmful combustion bi products and convert them into safer elements.   or a decat is basically just a straight through pipe without any of that restrictive catalyst material

Title: Re: Cat Back Exhaust
Post by: GSP1973 on October 01, 2015, 03:24:12 pm

Quote from: dronners on September 30, 2015, 11:21:01 pm

its a piece of pipe with boxes in it containing either a sound absorbing material or chambers to reduce the noise.  in regards to the cats/decat its either another "box"  containing materials laced with precious metals that react with harmful combustion bi products and convert them into safer elements.   or a decat is basically just a straight through pipe without any of that restrictive catalyst material

Sorry mate I maybe didn't word that too well..I know the function of an exhaust but my question was supposed to ask the difference a pre cat and de cat would have on performance , noise etc

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