Guest aldo83 Posted October 30, 2007 Share Posted October 30, 2007 Got jspec tt Auto with HKS Super dragger exhaust and I am considering taking off the 2 cats. Does this make much difference to performance and what sort of gains should I expect, oh and does it make it sound any louder? Cheers Quote Link to comment Share on other sites More sharing options...
hogmaw Posted October 30, 2007 Share Posted October 30, 2007 Yes have a look at this thread on bpu Quote Link to comment Share on other sites More sharing options...
chrisbilling Posted October 30, 2007 Share Posted October 30, 2007 Hi mate, double de cat will make a big difference, BUT you will need a 1.2 bar restricter ring fitted otherwise boost will be too high and damage engine. Yes it will be alot louder. I would recommend keeping the middle second cat in the system, until you upgrade the following: fuel pump Plugs install Restricter ring (from Chris Wilson) Hope this helps. Regards, Chris Quote Link to comment Share on other sites More sharing options...
Guest aldo83 Posted October 30, 2007 Share Posted October 30, 2007 Cheers Does it make much difference to noise level if removing the cats? Quote Link to comment Share on other sites More sharing options...
hogmaw Posted October 30, 2007 Share Posted October 30, 2007 Cheers Does it make much difference to noise level if removing the cats? yes - LOTS Quote Link to comment Share on other sites More sharing options...
chrisbilling Posted October 30, 2007 Share Posted October 30, 2007 Oh yes, get ear plugs for long distance. Quote Link to comment Share on other sites More sharing options...
M4RK RZ Posted October 30, 2007 Share Posted October 30, 2007 I need a restrictor ring too - what is chro wilsons user name? PLEASE ooo and also I need the de-cat pipes too - anyone QUOTE=chrisbilling;1656526]Hi mate, double de cat will make a big difference, BUT you will need a 1.2 bar restricter ring fitted otherwise boost will be too high and damage engine. Yes it will be alot louder. I would recommend keeping the middle second cat in the system, until you upgrade the following: fuel pump Plugs install Restricter ring (from Chris Wilson) Hope this helps. Regards, Chris Quote Link to comment Share on other sites More sharing options...
Guest aldo83 Posted October 30, 2007 Share Posted October 30, 2007 Cheers for the advice Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted October 30, 2007 Share Posted October 30, 2007 Dont forget FCD.... best of clicking this ---> BPU Quote Link to comment Share on other sites More sharing options...
M4RK RZ Posted October 30, 2007 Share Posted October 30, 2007 Do you know chris wilsons contact info Rob? Quote Link to comment Share on other sites More sharing options...
ivan Posted October 31, 2007 Share Posted October 31, 2007 http://www.mkivsupra.net/vbb/member.php?u=54 Quote Link to comment Share on other sites More sharing options...
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