arne Posted June 27, 2012 Share Posted June 27, 2012 I have a restrictor ring (TT bpu) between 1st and 2nd decat, 2nd decat and cat-back are 3inch. what's better; 2.5 inch first decat or 3inch decat? because I'm questioning the thing: 2.5inch > 3INCH >1... inch (restrictor) > 3inch Quote Link to comment Share on other sites More sharing options...
scotty71 Posted June 27, 2012 Share Posted June 27, 2012 Doesnt make alot of difference to be honest Quote Link to comment Share on other sites More sharing options...
Nic Posted June 27, 2012 Share Posted June 27, 2012 Not really any difference, if you had a 3" 1st cat then the hole in the restrictor ring would need to be slightly smaller, if you had a 2.5" 1st cat then the hole would be slightly bigger diameter to restrict the boost to the same level. Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 27, 2012 Share Posted June 27, 2012 alot of people "think" they have 3 inch decats but when they measure them they would find there 2.5 Quote Link to comment Share on other sites More sharing options...
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