Mega Bomb?

I got a 03 yz450f and i put a FMF factory 4 muffler on it, and i was wondering this mega bomb FMF makes will it lower the exhaust note? and what will it do for performance, make it better or worse?

I cannot speak on the Mega Bomb, but I can speak about the Power Bomb. I put the Power Bomb and Ti4 on my '03 450. The exhaust note did not change with the Power Bomb, but it pulls forever, in 3rd especially. The power delivery is real nice. I am sure the Mega Bomb would have at least the same increase.

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