Ok... I work at Carr Subaru and let me let you in on a little secret. What they are doing is blaming the aftermarket component so they don't have to fill out the warranty repair paperwork. They are just lazy and don't want to have to deal with Subaru. Fortunately in our case, we are very, very motorsport friendly. We even install most of our customers aftermarket parts (no warranty on the installations though). However, a good technician will really know if the aftermarket part is causing the problem. So I highly disagree with the dealership that says that a Weapon*R intake cased the problem. It's like saying that the intake system is causing a problem with the brakes because your car is faster. It's a load of crap.
I will say that there are some componets that we've found to cause problems in the cars. Here is an example: K&N Airfilters. Don't get me wrong, they are great filters. However, sometimes they come in over-oiled from the factory or the owner over-oils them when they clean their filters. Then the oil gets sucked into the intake pipes and gets into the sensors and then burns out the sensors. We've had several cars come in like that. Unfortunately, that's the owners responsibility.
Here are some tips if you are around a dealer that has a dis-liking to aftermarket parts:
1) Install your stock components if possible before you take it into service.
2) Never... NEVER give a list of aftermarket components to the dealership. The reason behind this is that they can report it to Subaru of America and put in on file. This is known as a "Witch Hunt". Subaru is actually conducting one right now on WRXs! They are telling dealerships to note any Boost Controller Upgrades because they are melting the pre-cat. So they want to see who's messing with their boost and making sure that it has not been tampered with.
3) If you are not comfortable with the dealership that you are working with, then always get a second/third opinion.
4) You can also try contacting me if you need help. I can not promise anything, but I will definitly see what I can do to help you out or at least try and point you in the right direction.
Well... I hope that Subaru isn't going to be mad at me for saying all of this