P R O V E E
38
Exhaust
There are a few options for tuned exhaust for the
PV.
Our Super Tuned pipe is one of the best pipes you
can buy for this application. It has won many races
and holds several records in this class (gas mono).
You can run the entire system inside the boat
(recommended), or you can bring the pipe up thru
the rear hatch.
If you do this, we recommend using epoxy and
glass cloth on the inside of the rear hatch, as most
of the left side will be cut away.
For internal installation, you can use either a 2 inch
offset 90 degree header, or our dropped header.
The dropped header will get the system a little
shorter overall, and require a smaller hole in the
transom.
One thing to remember is that you don’t ever want
to put any sideways pressure on the pipe. If you do,
something will eventually break.
When mounting the pipe, let it rest naturally (side to
side), before marking any hole locations.
Also, since these pipes are hand made, they are not
100% concentric. You can rotate the pipe on the
header and the center will change slightly.
Assemble the pipe and header to the engine (out of
the boat). You want a tuned length of 13-1/2 inches.
This is measured from the face of the exhaust port
(exhaust gasket) to the maximum diameter,
measured around the centerline of the header and
pipe.
If using our dropped header, run it as short as you
can. Leave 1-1/4 inch of header inside the pipe.
Slip the engine back into the mounts and put the
pipe on the top of the transom.
Spin the pipe around and try to find the center. This
gives you a little bit of sideways adjustment if you
need it.
Mark the exact position on the transom. Be exact.
Draw a line 5/8 inch below the top of the transom.
The center of your hole cannot be any lower than
this.
