That would be me! I guess I just know how to pick the dealerships! Actually, the only aftermarket parts I've ever gotten grief over have been the intake components, and a lot of that has to do with filter that are oiled! I had an aftermarket exhaust on my F-150, and the Service Dept never said a word to me. They did mention the aftermarket Intake I had (which actually used the stock air box, just a different free flowing intake tube), they would refer to it as "that thing" I had on my intake! I also had a K&N filter on my Explorer and that service department never said a word about the filter. It's the Nissan Service Writer I have now that gave me grief about the K&N Filter I had in the stock air box! The real concern I have with this service department will be if I ever do have a problem with the MAF while it's under warranty they will probably blame the oiled filter, even though I had one in my two fords, and never had a problem with either, and the Fords seem more susceptible to the oil fouling the MAF than other vehicles! And, most of the problems I've heard about concerning the Fords was due to the owner over oiling the filter after cleaning it! I don't traverse dusty roads that often, so chances of my needing to clean my oiled filter before 50,000 miles is slim! I remove the CAI before bringing it to the service dept now mainly because I don't want to deal with the lecture i'll probably get! And, it only takes me about 5 minutes to swap one for the other, and I do my own oil changes, so it only goes to the dealership with warranty items anyway! I've owned it since June last year, and last week was my first trip to the service dept!I have occasionally read that some of you have taken off your aftermarket parts before you go to the dealership for warranty work.