So the time has come for me to FINALLY get my exhaust (SPT CBE), I have talked withmy local reputable shop and the first guy shop NO problem easy install 45$ should take about 30 minutes. So here is where I am stumped

I called ten minutes ago to schedule an appointment for today, talked with a different guy, he askes the usual questions, make model etc. He then proceeds to tell me that he DOES not recommend me putting on the exhaust but to get an AP since 09's Wrx run lean (wich we all know). He kept emphasizing not to put them exhaust on then he mentions engines could blow. But he is selling Cobb AP's from 695$ to 595$. I am stuck can someone help me resolve this, it was a huge bummer for me too hear that sonce I could not wait too get too the shop and hear my Rex purrr

. The I asked his the big question, well dealerships can see if you have been tuned with an AP, he said "there is no way they can see it, only if you are an idiot and leave your AP out in the open". Can someone shed light on that one for me? My day is now ruined and I am all pissed off now. Sorry had to vent a little, but please your help is needed.