2006 stock end cap on a 2007 stock muffler?

i know an 06 stock muffler wont fit on a 07 header because of diameter but will the 06(41mm dia.) end cap fit on an 07 (31mm dia.) muffler?...if so will i see any performance differences and not just more db's?

I think the endcap will work. That's just based on the fact that Pro Moto Billet lists their endcap with the same part numbers. As far as performance:confused:

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