Who has a good price and are good at making them make horse power over my set of 440-1s i am going to get a set a little later i would like to keep my motor the same just change the heads my 440-1s are out of the box they have no port work on them do you all think 572-13s will make 50 to 100 more HP over my 440-1s THANKS for any help .

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