I would venture to say that there is a difference in volume, how much ? I have no idea. The pipe I had was definitely a different FMF part number & I suspect that is what 'smothered' the top end a bit. I had no overheating or anything like that although keep in mind I only ran the 200 pipe for a couple of hours.
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Fred Overstreet
2010 EC250 SixDays
2004 GasGas EC300 -Sold to a good home
2006 GasGas EC250-Sold to a good home
2006 GasGas TXT 280 Pro 
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