Andy,
Ask your dealer, specifically, for a print out of your "Unit Inquiry".
If your sleds electronic record at Polaris Industries/GE does not have your pipe noted on there... I'd put the stock exhaust on and take it to another dealer. Don't have your current dealer argue with Polaris Claims over covering your sled WITH the pipe on it!! That will make it worse.
BUT... since your dealer says "its going to get nasty" I would imagine that Polaris KNOWS now that your sled, by VIN number, has a pipe on it and will not warranty this. They are responsible for TELLING Polaris that you have the pipe and since they sold you the pipe with the sled... and did not tell you it voided the warranty... they should take some responsibility.
I've been warning Snowest-Polairs owners about this for a while. In our current economy with the big problems of huge cost of the repairs to these 800 CFi motors under warranty, they will be looking for ways to void the engine warranty...
It is not just Polaris Industries, but the Wall Street regulations of Fiduciary Responsibility to the share holder that has them handcuffed in a way. High times on Wall Street... Hard times on Main Street!!
That in conjunction with the fact that General Electric carries Polaris Warranty and Financing makes it more difficult... GE mandates the Policy on the warranty which is what makes it impossible to get ANY customer interaction on warranty claims. They are trying to limit liability.
This goes for ANY performance mod that is not SPECIFICALLY included in the warranty ... I believe the ONLY perf mod allowed under warranty is the SLP can.
If you have a fuel controller, Pipe, non-SLP can, Turbo, cyl head, reeds, aftermarket or home made fuel filter, electrical mods to your sled.... TAKE it back to stock before taking it into the dealer. Even if it is not a warranty service... you never know when the RSM or GE warranty person is going to be there taking notes on the sleds and running VIN numbers.
The dealers are starting to be asked by Polaris/GE to note ANY mods to the sleds even when they are being brought in for routine maint.
Even if you have a good dealer.... it is taken out of their hands these days by the electronic record "unit inquiry" that shows this info to ANY dealer working on your sled.
It is NO LONGER in your dealers hands or even the RSM to make warranty decisions... Polaris/GE has been known to fly out Claims managers rather than cover a warranty issue.
I know of plenty of Turbo customers that have been denied the update because of their mod... which is only right for someone who has aftermarket parts that almost double the designed HP...
AGAIN: There are NO Mods to the Polaris sleds that will not void the warranty other than the SLP brand Can. NONE! No matter what the dealer or aftermarket parts vendor says.
If you have any other brand can/exhaust on your sled... Keep it to put back on your snowmobile WHENEVER you take your sled in for service... warranty or not... Even if your sled is out of warranty for 800CFi owners since the warranty period has been extended.
IMO... this is a violation of the Sherman/Clayton act... in that they have not given other aftermarket MFG's the ability to get their mufflers (cans) on a list of approved mufflers that DO NOT void the engine warranty.
IF you own an 800CFi... and you have not had the update done because you want to run the heck out of your current pistons and submit the claim in the spring... I recommend that you at least schedule your update now AND have them order the parts... then check to see that they have them in stock with your name on them.... You can then keep pushing back your service appt while re-confirming with the service manager that YOUR parts are in stock and ready to install.