or maybe that's the problem
my 2 into 2 with no crossover are as close to equal length as i could get unscientifically
and for sure my bike pulls harder than before
changes were just the exhaust from stock to the 2 into 2 for comparison
and when i had aftermarket at the stock location, still not as much grunt as now.
I think there is a lot of room for improvement in the stock exhaust design...as you discovered. Like any OEM part; a compromised design executed at the lowest possible price point.