I have watched a lot of the Engine Masters vids, they have tested a ton of headers, mufflers and pipes. The engines most times a above a average street car but they discuss it in everyday scenarios.
View: https://www.youtube.com/playlist?list=PLUxS6dHlMqQJU8EOJw7U9KfoIisTU74xv
View: https://www.youtube.com/playlist?list=PLUxS6dHlMqQJU8EOJw7U9KfoIisTU74xv



