PowerPipe Exhaust for slant/6
A well designed thought out system does not need a band aid like a diverter. You need the diverter because you cobbled together the wrong size pipes and did not even bother to try and streamline the system. Look at the hyper pak set-up. Look at the effort the engineers at Chrysler went to to try and angle each cylinfer downstream. If you can not at least duplicate that you are wasting your time. Take the time to angle all pipes the correct way...DOWNSTREAM!
I have given you all the info you need to do it better....as it is right now you would be better off going back to your original pipe and correcting the flaws with it rather than working on the above design with that pipe layout and size.