Modified Exhaust Pipe ala Bingelis

One of the methods I want to try to reduce the noise of my Tailwind is
to modify my exhaust pipe as described on page 101 in Bingelis' book
"Firewall Forward." I have a couple of questions.
1) First, has anyone done this and how successful was it?
2) On pages 101 and 106 Bingelis says to bend the rod "back for louver
effect." But in the example on page 107 it looks like the rod was bent
forward to make the louver. Tony describes it as an "excellent job."
Bending back would seem to allow the exhaust gas to escape out the
holes and bending forward would seem to allow the relative wind to flow
into the holes. In either case the flow of the exhaust gas out the
pipe would be disrupted, which, I think is the intent. Any suggestions
on which way to go and if one way would work better than another?

Thanks,
Tom