Boge Posted November 9, 2012 Share Posted November 9, 2012 If I was to only do a single decat (meaning one cat left in) which one should be removed for least effect on loudness but best on response? Or is this a stupid question and either will give the same response? Also if double decating a tt vvti is a restrictor ring needed? Cheers Link to comment Share on other sites More sharing options...
hackin_n_bashin Posted November 9, 2012 Share Posted November 9, 2012 If I was to only do one, it would be the first one, hardest to get to though. I believe it's the most restrictive, but will allow an easier time of it if you want to put the second one on on the future ( you will!) And yes, if your double decatting you wil need a restrictor ring on a vvti too. Link to comment Share on other sites More sharing options...
Jellybean Posted November 9, 2012 Share Posted November 9, 2012 All explained in here http://www.mkivsupra.net/vbb/showthread.php?94705-BPU-(Basic-Performance-Upgrade) Link to comment Share on other sites More sharing options...
Boge Posted November 9, 2012 Author Share Posted November 9, 2012 Thanks guys! Link to comment Share on other sites More sharing options...
Boge Posted December 6, 2012 Author Share Posted December 6, 2012 If I only remove the first cat am I right in thinking no rr is needed? Also could I up the boost to 1bar without installing FCD or boost cut controller? Link to comment Share on other sites More sharing options...
mattdavies Posted December 6, 2012 Share Posted December 6, 2012 With only one cat you would not need a RR. You would need a FCD or Boost cut controller @ 1bar as this is when fuel cut occurs Link to comment Share on other sites More sharing options...
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