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#4: 02-26-2013, 04:26 PM
 
 baci
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Title: Junior Member
Location: SL,UT
Car: '08 spec.B
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My cousin has a wrx that passed in CO the first 2-3 years with high flow catted DP, this year it failed and he swapped back to the stock DP for the test. For a 15-20 ISH HP gain id do it. Just keep the stock DP so that you can go back to it in a few years when the cat fails. For a hour or two of wrench time that really isnt terrible to swap, or pay $80 to have done at a shop.