I have two set of the tti headers..one on a 71 dart..one on a 73 duster.
the dart has the large oe mopar stater...the duster has the small starter..
I have installed alot of headers in my 55 yrs...and these are the easiest i have ever done.....been thing is no exhaust leaks...and they still look nice 3 yrs later...
are they expensive....hell ya...but worth it...
