Here's my experience:
I did a very approximate before and after exhaust test with my car. (Holding a
stop watch while driving from 5 to 80 MPH.)
The "before" system was stock for a 72 - dual exhaust manifold and pipes with
muffler.
The "after" system consists of Triumph Tune 6-2-1 header (ceramic coated) and
Triumph Tune single 2 1/4" stainless exhaust with a free flow silencer. It's
fairly loud but not awful.
I forget the exact ET's, but I do recall that the "after" system shaved nearly
a half second off the ET compared to stock. I ran each test 3 times on the same
stretch of road. This was not a truly scientific test, but it was enough to
satisfy me.
The TT headers needed some tweaking to fit, but I have no complaints about
them. Good quality stock and flanges. The stainless system is a quality piece,
too. I'd hat to see what these puppies cost now!
Jim
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