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Is their a significant performance gap from a dealership performance exhaust (under warranty) and an aftermarket exhaust (voids warranty)? If not I'll get the dealership one and if so I'm thinking of an Invidia with j-pipe.
 

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If a dealership sells you an exhaust that increases engine output significantly my feeling is that they should be prosecuted by the EPA and their operations shut down. This is because those exhausts that can significantly increase engine output eliminate emission controls, and are illegal for use on any vehicle on any public street anywhere in the United States.
 

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No dealer sells a performance exhaust. They sell a spt exhaust but it's just a noise maker. A very expensive one.

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I'm sure what the others said is true about no performance gains. Or if they are, the only thing that could really identify them due to the small amount of gains is a dyno.

I opted for the SPT exhaust to get a little more rumble at a cheap price. Because I ordered from a club wrx sponsor dealer, the exhaust was well below the price of your standard aftermarket catback, and I didn't have to pay somebody to install it.

Plus there is no risk of a dealer claiming modification should a warranty fix of some sort be needed.

But my motives were to get a little bit more grumble, stay in warranty, and not have to deal with it.

Pick your poison
 

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Best bet is to buy an aftermarket exhaust. The SPT exhaust is 2.5" compared to the stock WRX 2 3/8" diameter


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You're not going to see a performance bump from any catback alone, and if you go with a J pipe you're taking a chance of having any warranty claims voided.
 

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As many have indicated, any exhaust modification that could possibly increase power will give SoA clear justification to deny warranty claims. The optional $1169 (US) "STI performance exhaust system", does not give any noticeable increase in power but (obviously) would not void your warranty.

Actually, I am told (via 3rd party, someone I know, knows someone at SoA) that ANY non factory ECU programing (normally required for intake and exhaust mods) is currently grounds for warranty claims denial -including drivetrain failures- (clutch, gearbox, etc) and that the current ECU keeps a non volatile (permanent) log of flashes so restoring it back to stock before taking to the dealer for a warranty claim will not work.
 

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As many have indicated, any exhaust modification that could possibly increase power will give SoA clear justification to deny warranty claims. The optional $1169 (US) "STI performance exhaust system", does not give any noticeable increase in power but (obviously) would not void your warranty.

Actually, I am told (via 3rd party, someone I know, knows someone at SoA) that ANY non factory ECU programing (normally required for intake and exhaust mods) is currently grounds for warranty claims denial -including drivetrain failures- (clutch, gearbox, etc) and that the current ECU keeps a non volatile (permanent) log of flashes so restoring it back to stock before taking to the dealer for a warranty claim will not work.
For what it's worth, even if an ECU keeps a log of flashes, disconnecting the battery causes an ECU flash (not loss of memory of course..but just a log of it being flashed) so that would be a hard battle to fight.
 

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As many have indicated, any exhaust modification that could possibly increase power will give SoA clear justification to deny warranty claims. The optional $1169 (US) "STI performance exhaust system", does not give any noticeable increase in power but (obviously) would not void your warranty.

Actually, I am told (via 3rd party, someone I know, knows someone at SoA) that ANY non factory ECU programing (normally required for intake and exhaust mods) is currently grounds for warranty claims denial -including drivetrain failures- (clutch, gearbox, etc) and that the current ECU keeps a non volatile (permanent) log of flashes so restoring it back to stock before taking to the dealer for a warranty claim will not work.
You don't need to tune your car for a CBE.
 

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For what it's worth, even if an ECU keeps a log of flashes, disconnecting the battery causes an ECU flash (not loss of memory of course..but just a log of it being flashed) so that would be a hard battle to fight.
I am using the term flash in the computer vernacular i.e. flashing the ROM, meaning updating with a new set of instruction parameters. I doubt that the unit registers a reprogramming log entry when the battery is disconnected (or drained.)
The info I was given was that SoA sent a notice to dealers that they would not reimburse dealers via warranty claims for specific engine and drive train failures if the ECU had ever been reprogrammed (that was not registered in the Subaru service log) or if various parts (and there was supposedly a list) had been fitted.

Sucks, but having been involved in design and also QA, I do also see SoA's problem: if you reprogram your ECU you can basically tell it to do anything. How could (even if they wanted to try) determine if those parameters were detrimental? (there are hundreds, even discounting tuning professionals who tweak those setting) Also keep in mind that your engine and drivetrain were designed (to have <X failures over a given period) within a specific performance envelope. Change the amount of boost or torque and those failure figures go up quickly (including things like the clutch and drivetrain).


Any Subaru dealers or service mangers care to confirm or deny this? (or was it covered by a NDA) Seems like info owners should have.
 

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The ECU does not reflash itself when you disconnect the battery. That's absurd. It looses temporary data like learned fuel corrections and stored codes.

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