Yeah I had the same thing happen to my '08. The cold air is what makes it really show up! Cold air is a turbo's best friend but can still be an enemy. Haha. And yeah those boost patterns are usually higher in the higher gears which is why it shows up then. I've seen some Subie teks suggest to just increase the tune program to where the car allows for those higher boost limits without throwing your light. Obviously not a "fix" but its what I've heard suggested. Mine is pretty much bone stock with the Cobb intake. Had it on the car for a few months and ran fine even in 5th in WOT but as soon as it got cold out, I can't get past 90mph in 5th in WOT without the CEL coming on. Mistake I made though (found out well after I bought it) was that the Cobb intake required a tune no matter how mild or aggressive my mods were. So needless to say I put the stock intake back on and (understandably) that thing runs far better stock than it did with the intake and no tune! No more engine buck/turbo lag! And I'm not feeling up to spending 600 bucks on a tuner at this point in time until my warranty runs out. Hahaha.