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The mkiv Supra Owners Club

de-cat question


arne
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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

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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.

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