Actually in this case, he would have a double split,
HELLO?
and the second would only have an effect on sound & velocity......if the second split is done efficiently................HELLO?
:D
Anywho.............until Deemo gets his headers, all the 6-2-1 talk is pointless, MORE important is that he is sure to pick headers that can accommodate a change to a 225
if he decides to switch, & there aren't a ton of choices if he sticks w/the 170.