factory 7 is the same as ct and trinity, they are all the power pros pipe with the companys name on them, and i choose factory 7 bc for the price you cant beat it
but you gotta remember that all these pipes are for different things...toomey is only good for stock motors...f7,ct,dunkin,and most of the right side pipes are for modded engine...so it depends on wat mods you got...
fmf is great for ported stroked stock cylinder. but it really sucks on a ported 240, waiting on a dynoport or power pros. those are supposed to be for the big cc mod engines