Ive seen that some factory type -in the midsection tuners on racers are like megaphones in effect. On stock OMC 31.8ci motors the tuners are smaller at the exit, and sort of squared cone pipes.
Other than try-in and fly-in Can I expect any result from shortening one of them? Since this isnt a stock lower unit or mid I have to shorten it anyway then exit the exhaust out the back.