Red Headed Stepchild-75 Swinger LSX Swap

You gotta be careful with transition length. I read some testing years ago by Corky Bell that said something to the effect of double the diameter of the larger pipe in length is the minimum. So for a 4” to 3” transition you’d want to use 8” of length minimum to do it or it’s a power looser. I hope I’m remembering that correctly. I’ll see if I can find where he said and tested it.