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FMF Q4 exhaust?

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What is the best header pipe for FMF Q4? If I were to take out the spark arrestor and essentially have an Open Q4 exhaust, how would that affect performance, decibel level, tone etc?

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I'd recommend staying with the FMF header with the FMF can.

I'm getting older now (still in my 40's so not that old ;) ), so I run my bike with the spark arrestor in my RS2 all the time. The power increase without the insert barely noticeable, but it is quite a bit louder and the noise gets annoying. 

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