Sorry I havent been on in a while, college and afrotc has me busy. I have pacesetter shorties into stock pipes and cats, then into the 3" stock. From that it goes into the Flow 10 and into two 2.5" pipes. Im running polished rolled tips straight out the back. Honestly the in cab drone is not bad. I was running a cherrybomb vortex and you cant hear a difference in the cab. Big difference out side tho. When i have the windows down or the extended windows vented I can hear it. The flow 10 doesnt have the backfire noise that the 40s and 44s have. I would go with the flowmaster super 10 due to it is made of stainless steel. Hope i answered your questions
single in duel out flowmaster 40 umm it sounds great to me on the out side. you can can hear it slightly while drive down freeway but radio can drown it out you can hear best at take off between 1500 and 2000 rpms its the deepest and loudest tone any questions you have ill do by best to answer.