an Old time diesel grease monkey and I were sharing thoughts and he told me that diesel do need some "slight" back pressure.
Ever since I heard that they do need some pressure a while ago on this forum iv been searching like crazy on this forum to read up on more.
He said that only down pipe is too Little and with the cat its too much(perf wise). 3.5 dp to 4 is good and 4 tb is good.
it was all about 6.0 and diesel in general. and he loves AMSOIL
Im not trying to get a huge confliction here but just throwing out my info. but please go ahead and comment
