Just wanted to throw something out there to see if anyone has experienced similar problems. I purchased an MBRP can for my 07 IQ 600 CFI last year and put in on the sled. Immediately I started having trouble. Irregular idling and severve mid range hesitation. I removed the can after about a 100 miles and replaced it with the stock silencer. The next time the sled was out it burnt down the PTO cylinder...lean condition. Polaris blamed it on the ECU. THe motor was rebuilt and it is running strong ever since with the stock can. Just had the reflash and found very little difference. Recently I put the MBRP can on my buddies 06 Fusion 600.....MBRP lists the same stock number for each sled......and his sled began acting strange. Irregular idling and the DET light came on at WOT. Pulled the plugs from his sled and noticed that the PTO side was really lean with white residue on the plug. THe mag side was much darker. Ran a plug test with new plugs at about 1/4 mile....pulled the plugs and the mag side was fine however the PTO had white residue on it again. Took the can off and replaced it with the stock can. Maybe it is just a coincidence that both machines acted the same way. I called MBRP last year and they refused to do anything about it saying the can was tested on the CFI sleds and worked great. I sent an email yesterday reagridng the fusion and they said they would look into getting some from of warranty for me.