Pypes Performance Exhaust HFM36 - Manual

HFM16/ HFM36
1999-2004 Ford Mustang GT -
Off-road & Street Legal (49 states) H-pipes
Pypes Performance Exhaust
2705 Clemens Road Bldg 105A Hatfield, PA 19440
800-421-3890 (voice) 267-638-3507 (fax)
www.pypesexhaust.com
Thanks again for purchasing your new 409 stainless steel Pypes Perfor-
mance Exhaust Ford Mustang off-road or street legal H-pipe. Please be
sure to confirm all the components in the kit were received in your ship-
ment before beginning installation. If you find any component missing,
please contact our office at 800-421-3890 for replacement. Installation of
this kit will require a few simple hand tools, a cutting device and penetrat-
ing oil. For a quicker and tighter installation, air tools are recommended.
Technical assistance is available both online at www.pypesexhaust.com or
800-421-3890.
HFM16
1. Begin by disconnecting your negative cable from your battery, as you will be disconnecting some electrical components. Place
the vehicle on a lift or (4) jack stands at maximum height. This will aid in an easier installation. Note: Make sure to support your cat-
back just past the connection point between the factory h-pipe.
2. Unbolt the factory h-pipe from your cat-back. Soaking your factory mounting points with penetrating oil will allow for easier
removal. Next, disconnect your 02 sensors from the factory wiring harness and remove them from the h-pipe using a 22mm wrench.
Remove the bolts at the manifold/header end. Be careful, as old or rusty parts tend to break easily. On the passenger side header has
a thin metal gasket which can be reused if not damaged. Any slight mark or bend in the metal will cause a leak at the header. A new
gasket can be purchased from your local Ford Dealer.
3. Begin by installing the driver and passenger side down-pipes/front legs ( Street legal versions using cats will require 8-1/2” to
be cut off the down-pipes legs, further instructions below), snug the bolts but do not tighten. Note: 96-04 GT owners, make sure to in-
stall the metal gasket on the solid flange and the sleeve in the driver side leg. A small amount of RTV silicone will help hold the gasket
in place.
4. Next, install the H-pipe portion. Position the ball portion
so that the long leg is on the driver side and the short leg is on
the passenger side. Slide the (2) HVC21 band clamps on to
the front legs of the x-pipe. Now, slide the x-pipe on to the
driver and passenger down-pipes matching the ball
ends to the cat-back. Re-install the factory cat-back
hardware and snug tight. If hardware is necessary,
you can purchase an HVC35 kit or 3/8-16 x 2-1/2”
bolts, nuts and washers from a local hardware store.
5. Supporting or jacking up on the
center of the H-pipe will aid in the system
having the most possible ground clearance.
Finish by tightening all the hardware and then
the (2) clamps, making sure the H-pipe is
adjusted properly. Last, install all the 02 sensors
and connect the wiring to the factory harness.
Note: 99-04 owners should consider MIL Eliminators
to insure proper computer and 02 sensor operation.
04 owners will require 24” 02 extenders.
6. After all the connections are tight, start the engine.
Check and listen for any leaks. Make sure to check your
connections periodically as they may come loose.
HFM36
These 49 state street legal versions will follow the same instructions as above aside from two cuts in the down-pipes, the instal-
lation of the cats and (2) additional HVC21 band clamps. These additional instructions happen between steps 3 & 4 above. You will
need to cut 8-1/2 inches off the back of the two down-pipes before installation. Next, install the clamps on the expanded/slotted end of
the cat. Make sure the O2 sensor plugs are tight on the cats. 2004 GT owners can use the cats 02 sensors and plug the ones in the
x-pipe. Finish the install by sliding the cats on to the down-pipe legs and the H-pipe into the back of the cats.
*** Federal laws prohibit the use of HFM16 for street use.
Check with local and state authorities for the legal use of HFM16 and HFM36.
COMPONENTS
(A) 1 set DFM36 Front Legs
(B) 1 set HFM06 H-section
(C) 2 HVC21 Clamp
(D) 1 HVC40 Clamp
(E) 1 XFMSLEEVE Downpipe Sleeve
(A)
(A)
(B)
(B)
(C)
(C)
(D)
(E)