Muffler Slip On exhaust

I have a YZ450F 2006 and thinking of buying a slip on exhaust, just wondering if there is 1 better than the other.

I like the FMF 4.1 slipon I had. smooooother and moore power

I got a FMF Q4 for my bike because it was quieter than stock, has a spark arrestor, and looks great once you peel off the fmf stickers!..:banana:

i put a pmb cap on mine and i couldnt be happier. has the s/a in it and all!

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