I have this discussion with oldsters trying to recapture their youth, lol .
They remember the headers of old, leaking, dragging, spark plug access, ***** to install , - for the novice,
They sometimes balk when I include headers in the build, for all the old reasons .
I bring them into this century, guaranteeing no leaks, no ground clearance issues, etc. etc .
I check the flanges are true, or make them so.
Doug's, - - when they are on sale, - that simple, long tube equal length, tuned headers, true scavenging, no kitchen sink plumbing around the steering.
A 4 inch outlet on what used to be a 2 inch air pump !
Common sense !
Not a single complaint, not one ! !
And seriously, - with all that bitching, how often do you change plugs ? ?
Can't use that excuse with Doug's/TTI, plugs are easy access !
My plugs haven't been out in a coupla years, maybe 3 .