For those of us out there who choose to be affected by the MOD Bug, but do not want to void warranties. Here is a list of simple modifications that are either not going to void a warranty, or at least should not raise any eyebrows if you have to take it in... This list is basically for those individuals who have the dealership's mechanics do all of the installs to minimize the risks of sketchy warranty claims. This is not a definitive list, and different dealerships have different policies for different mods. If a dealership wants to, they could try to use circular logic saying that your specific mod made you push your car harder and caused something to break....I dont know that one.
All in all, the point to remember is that if you choose to mod, be willing to shell out buku bucks just in case you catch a Subaru official on a bad day...
A warranty is not a blanket term placed on a car that you only get one of...Example: If you mod your exhaust, Subaru cannot deny your claim to fixing your air conditioner, but they might try to deny claims on your engine and / or drivetrain.
-Any type of catback exhaust is fine as long as you dont mess with the catalytic converters. Again, you are perfectly fine with just a cat-back system.
-Downpipes and Uppipes are probably not going to be good for a warranty claim...
-Intakes will net you many different responses across these boards as to the actual gains / damages associated with them.
-I would suggest that if you must have one, the SPT intake is good because it is made by Subaru for Subaru and dealerships should have no or minimal qualms about them. I would suggest the Intake Heat Shield also...
EM (Engine Management)
-I probably would not do this if you want to be as discrete as possible. There is always a chance of someone finding out at your very own dealership and that could raise several red flags for warranty work.
-If you want to retain your warranty, dont do these mods...
-Aftermarket turbos will hurt you in warranty claims.
-Engine port and polishing could hurt you if it is found out.
-Increasing Bore in your engine will most definitely hurt your cause.
-SPT or STi makes several products for our cars that are very good quality.
-They make short shifters, bushings, tranny and engine mounts, etc.
-Lowering springs are an "iffy" situation. They probably would not do too much to hurt a car in theory, but there could always be some person out there looking to save Subaru some money and could argue that your springs did something bad and put pressure on some system.
-Strut bars should not do much to hurt your cause, unless someone tries to pull a fast one on ya about driving a certain way. SPT does make a set of Strut Bars just in case.
-Sway bars could be iffy unless you get something made by SPT or STi because they are a vital part of your car's handling.
-I believe that most of these mods are good, unless you try to get them to fix something like a damaged lip that you put on aftermarket.
-Wheels and tires are the same way, do what you want...
I hope that this helps someone....