I'm familiar with the Monster Flow Filter because I use it as a spare when I'm cleaning my KKM.
Sorry to say my Dyno results showed about a 3 to 5 HP loss with the Monster Flow over the stock filter and about 7 to 10 HP loss to a KKM.
As a result I read up on filters and found the suface area with foam filters typically has to be much larger to equal cotton/paper filter because foam is more restrictive.
Anthony B. Davis
2Deep2 Silver SVT
2002 IASCA SQ Ult Ama 601+ World Champion runner up
2002 SLAP dBQ Champion

2000 USAC SQ World Champion
2002 USACi SQ World Champion