I did a search on different exhaust set ups, but I couldn't find one that directly addressed doing turn downs right after the muffler. Just a few references to them. So, I think turn downs straight of a set of 40 series Flowmasters is what I'm going to do. I just want to know of any pros or cons. Right now I think the exhaust is choking the motor. I still have the original exhaust from the military 6.2 with mild 350 and Thorleys. It looks like 2.5" to the mufflers and 2.25" after. That can't be good.