Is there a flow difference ie backpressure and or sound difference between these two pipes? Just completing a 95"/ Andrews 26g, SBC head job with Mikuni 42. Want to maximize what I've got but don't want to wear ear muffs to ride it. Is anyone familiar with D&D's slip-on for the dyna? Also what's a good place to start at for the carb set-up? Many thanks to all! Man this is exhausting!!