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Is my cat gutted?

1K views 0 replies 1 participant last post by  bigred419 
#1 ·
I am wondering if my CAT is gutted from the previous owner, or if there might be other things going on.... I am running Cobb stage 1 on a "stock" wrx. The only things I know of that are not stock are the spt intake and an aftermarket muffler (thanks previous owner). When I monitor my boost on the AP, I will often hit higher boost than the map's target. The other day when out beating on her I had a peak of 16.6 psi. Is this normal or an issue with using the AP as my boost gauge? I get CEL code P0420 very infrequently which makes me wonder if my CAT is potentially gutted. Would gutting it cause boost spiking like Cobb warns about on catless dps? I plan on going stage 2 some day, but have other things I feel I should replace first since I have 123,xxx miles on her (suspension, probably my clutch, etc.). Let's hear your thoughts....
 
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