BMW M5 Forum and M6 Forums banner

4 into 1

  1. Headers question...4 into 1 and 2 into 1 what's the difference?

    E39 M5 and E52 Z8 Discussion
    I was poking around under the car today and I noticed the Nowack set up has each bank having two collectors each grabbing two headers then a foot or more further down those two merge in to the main pipe heading south on that side of the car. My question is on the reason for that version and the...