FMF 4.1 & Megabomb vs Yoshimura RS-D4.. 2013 CRF250R

Looking to get a new exhaust system. Looking for something to give alot of bottom For Supercross/Arenacross style of tracks. Trying to choose between FMF 4.1 with MegaBomb or Yoshimura RS4D, heard good things about both of them. Cant decide.. Help?

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