I have 25 hours on the 14 now, 10 with the "new" exhaust hangers. If your system is working ok, leave it alone. If you are getting any vibrations in the tunnel or side skins then consider what I did.
Go to your local automotive supply house and purchase one of these exhaust hangers
You can see where I cut the piece out of one side and I am using the old part as a template to drill the 3/16" holes. After the holes are drilled I cut the piece using a band saw. A belt sander made quick work of the edges. Then I slit the piece using the band saw again; just enough to capture both ends of the attach points.
The original hangers used plastic bushings in each end and I installed these in the metal brackets on each end before sliding the rubber piece into place. It nicely captures those bushings and then longer bolts are installed with washers on both sides. Tighten the bolts just enough that they are not loose, then install cotter pins. I elected to put the nuts on top but I do not believe it matters which way they go with this installation. The cotter pins are
Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average
speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger flying #153
St.Thomas, Ontario Canada, CYQS