hp loss with 2.5" true duels?
I kind of think it would be about the same as a Loudmouth vs. a cut out because:
one 3.5" pipe (y-pipe exhaust) has an area of 9.6211"
vs.
two 2.5" pipes (my x-pipe true duel) have a combined area of 9.817"
so....what....5-10 hp?

