Some time ago, I noticed my 04 forester xt just doesn't feel as quick as it used to. It seems to run just fine, but power below 3k is non existant anymore, and it just doesn't pull hard. I have stage 2 cobb with downpipe back and still manage 14.5 lbs but it just doesn't feel quick. The idle maf shows 1.7 volts, and wide open it's at 3.2-3.6 in third or fourth. The maf g/s max was 158 in third and 162 in fourth. Timing seemingly fluctuates normally between 25-40 degrees. Anyone else experience this?