OK, I want some back up and some reasonable knowledge on a few subjects about Single Out vs. Dual out, pipe size, and BACK PRESSURE?!!!!!!! Dyno’s, or any proof would help. I have read and reread and I am still confused. The vehicle I want to specifically know about is my 2005 ram hemi QC. I am going to probably end up getting a Magnaflow muffler. Do I want to run it single out, or dual out? Does single out create the appropriate amount of backpressure for the hemi? If I run dual out will it be too much? Is there such thing as too much back pressure? If so, who says it’s too much? I have read that some people say Hemi’s without backpressure at all is the best way to go, some race without mufflers, etc. Lastly, if I run a dual out magnaflow is it TO much backpressure if I used 3” pipe vs. 2 ½”? Does it make a difference on sound, backpressure, performance? I guess I am one of the few that have always figured that the larger the pipe, the more air moved. I thought the design of engines, intakes, exhausts; etc was to get the most air flowing as quickly as possible? Someone/everyone please help me with this. What do I want to put on my truck, Single out or dual out? What size pipe to run? I just want to get the best system for my truck without losing sound, torque, and overall performance. Let me know what everyone thinks on these topics.