I dunno if MBRP is aware...but I talked with the StealerShip when I was looking at the 6.4TT...and they said that ANY changes to the exhaust...other than after the filters to the tip are NOT covered under warranty. So, from their info...if you don't have the side dual exit out the passenger rear like on the stock truck, you are in violation of warranty. Just a little nugget of info. I also talked to a Tech at my dealer and he said that on the 08's, if the exhaust has changed from stock, they will void the warranty...all of it. I know this is just spoken word from a dealer...but food for thought. Ford is getting testy with the warranty claims and will try anything and everything to deny a claim. (Just like our beloved insurance companys!)