T-5 r more of a top end pipe...
FMF is a bottom to top pipe!
not to be bias from my sig..
I have had both and I like FMF better..
And sister of toomey, is pro circut so other top end..
That is just my opinion...
Maybe some other people who have rode several different pipes will
also put there 2cents in!
I have not tried cpi's yet have heard all good things from that pipe!
Hope this helps out