Mine with the Yoshi 4 into 2 into 1 has got the deeper growl
It's got a real bark when you get up it.
As for which one is faster they are both stock just pipe , air box mod & pair removed.
My mates got like 100 pound over me and he can get going on the open road a lot quicker. But I can man handle it around the twistes a bit harder.
cya shane