suprababy Posted August 26, 2004 Share Posted August 26, 2004 Hi got a U.K Spec TT, at min it has stock exhaust with both cats still in. Just for now i just want to replace one of the cats. Which one would be the better to replace i.e giving better gains etc. Also will removing the first cat enable it to pass Mot or will it only pass with removing 2nd cat? Thanks Link to comment Share on other sites More sharing options...
merckx Posted August 26, 2004 Share Posted August 26, 2004 Just replaced both of mine last week:nana: I would replace the first catalyst as it is more restrictive, it should pass the MOT with either catayst still on the car. Not sure what it will be like with the standard exhaust though? If you do a search for decat you will get all the info you need. Link to comment Share on other sites More sharing options...
JohnK Posted August 26, 2004 Share Posted August 26, 2004 Yep do the first cat. Thats the one closest to the turbos which causes the most heat buildup in the engine bay. It will pass an MOT with just he second cat, my does easily. Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 26, 2004 Share Posted August 26, 2004 Originally posted by suprababy Hi got a U.K Spec TT, at min it has stock exhaust with both cats still in. Just for now i just want to replace one of the cats. Which one would be the better to replace i.e giving better gains etc. Also will removing the first cat enable it to pass Mot or will it only pass with removing 2nd cat? Thanks Definitely the first one, nearest the engine. It's the most restrictive. I am looking at 4 in stock now.... Link to comment Share on other sites More sharing options...
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