I'm thinking I'd like to supplement my 16 inch bar with a 20 inch on my MS390 with muffler mod. The 390 easily zips through all the oak around here. I've recently started using RSC chain and really like it. But sometimes the 16 inch bar is stretched a bit to get through the bigger trees and logs. The power is there, just not the length. I figure a 20 inch is plenty, though, and shouln't push the 390 much. Does that sound about right? I have a 3/8 inch sprocket so I assume that any bar/chain combination that is a 3/8 chain will work, right? Hoping to find a used one on eBay.