Hello! 15 Suburban, stock apart from a Air Raid Jr. intake tube and highflow filter in the stock intake box. Looking for recommendations, I am thinking about installing a magnaflow muffler only to my otherwise stock exhaust. I want to keep the resonator and flapper. My question is, if I am looking for drone free during cruising and light load would the 18" work? I was thinking the 18" would be drone free as the flapper would help a lot. I am looking for basically for a sound similar to the GM borla accesory exhaust in term of sound level and quality of tone. Also I liked how a last gen escalade sounded stock, seemed louder to current gen. I just wan to be able to hear its a v8 at start up and when I get on it. So 18" or 22"? thanks!