4-2-1merged header question
 

New used set of 4 2 1collectors 4 christmas. merged with a cone style 3.5 outlet 8 inchs long
Half inch flared outlet with 1.5 long neck down of 3 inch tube... 16 inches of the twin 2&3/8 inch tubes .Where to put pan -e- vac bungs.?? Large part of collecters look too short for them. Would 2 in each sides 16 inch long twin pipes work with a Y to valve covers work. And it would need then installed one vertical and 1 horizontal on the twin tubes to keep the firing order from hitting a twin tube back to back thanks.

Re: 4-2-1merged header question
 

Seems to me you would add a little collector and put them there.
Yes, sometimes you have to turn one collector 90 deg. to separate the pulses.