martyc Posted May 23, 2015 Share Posted May 23, 2015 Hi guys, looking for some advice on what to get/do. Currently have a prodrive backbox and (i think) centre section that i bought off the 'bay. The centre section has rusty flanges despite being a stainless pipe (not a fan of dirty flanges) and doesn't seal very well at the bb flange so I'm considering replacing the centre section and 2nd cat with a decat and keeping the back box. The questions are: Do prodrive centre sections have cast flanges as opposed to stainless or have i been stitched up? Will a 2nd decat throw a CEL or require a remap? What is the standard downpipe cat capable of flowing power-wise? As tempting as it is, i want to try keep it emissions test friendly rather than going down the full decat route. Sorry for the amateur questions, i have done a search but couldn't find what i was looking for! Quote Link to comment Share on other sites More sharing options...
jay14 Posted May 27, 2015 Share Posted May 27, 2015 Does the ppp model have only one cat? Quote Link to comment Share on other sites More sharing options...
martyc Posted May 28, 2015 Author Share Posted May 28, 2015 Apparently the ppp does away with the rear cat ie the one after the main on the wrx ppp Sent from my SM-N9005 using Tapatalk Quote Link to comment Share on other sites More sharing options...
ChrisD Posted May 28, 2015 Share Posted May 28, 2015 You can normally get rid of the Up pipe cat with no MOT Issues, aftermarket sports cats remember you need them hot for them to work well and pass the MOT, if you were to do any i would say the Up-Pipe (get a decat one from the STI), its a bigger job to get it fitted as it means taking out the turbo (Probably £160 fitting cost) but will give good response different, also it can be an issue if they disintegrate the cat inside goes through your turbo and ruins it. Quote Link to comment Share on other sites More sharing options...
jay14 Posted May 28, 2015 Share Posted May 28, 2015 Is a remap needed after changing to a decat up pipe? Quote Link to comment Share on other sites More sharing options...
ChrisD Posted June 1, 2015 Share Posted June 1, 2015 if it was me I would re-map. one to get the most out of your better breathing and two to stop any over boosting or anything like that :) but if you are getting the re-map it may be best to think what else you may do in the future and trying to combine it all together to save re-re-mapping down the line. (trust me, Mines in for its third re-map :') ) Quote Link to comment Share on other sites More sharing options...
stants Posted June 1, 2015 Share Posted June 1, 2015 Yes you will need a map ideally as the turbo will possibly be over spooling due to the gasses flowing quicker Plus you'll end up with eml codes being thrown up which won't be able to remove without mapping Quote Link to comment Share on other sites More sharing options...
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