.6L 3v V-8
P/N 1675S
Rev. 10/06
Read all instructions carefully before attempting installation. Installation instructions for
JBA Cat4ward® Headers P/N 1675S
05-06 Ford Mustang GT 4.6L 3v

NOTE:
Installation of this product requires an adequate workspace, general
mechanics tools, general mechanical know-how and a reasonable degree of
experience. Most auto enthusiasts with these resources will have little difficulty
installing these headers. However, you should carefully read these instructions
before attempting to install these headers. If in doubt, consult a professional
mechanic. (Better to do it now than to get stuck halfway through the installation.)
This part is certified for use on Emission Controlled Vehicles.

By installing your JBA Performance Exhaust product, you indicate that you have
read this document and agree with the following terms.

The Purchaser is responsible for following all installation instructions and safety
guidelines supplied with JBA Performance Exhaust products.

JBA Performance Exhaust assumes no responsibility for damages resulting from
improper operation, misuse, abuse, or lack of responsible care, or any problems
resulting from incompatibility with other manufacturer's products.

Included with your installation instructions is a copy of the product warranty.
Please read it carefully before you begin any work on your vehicle. Should you
have any questions about the warranty policy or installation, please give JBA a
call at 619 229-7797.

JBA uses sealing beads on all its headers. We have found that when installed
correctly the raised bead around each port increases the pressure exerted on the
gasket directly adjacent to the port and effectively prevents leaking gaskets. It is
important when installing the header, to install all bolts loosely, then tighten
evenly to ensure the flat installation of the flange. It is normal for the flange to be
raised off the cylinder head the thickness of the sealing bead.

To prevent leakage, it is important to tighten the flanges on any set of JBA
headers carefully by using the proper procedure. The torque sequence from one
flange to another will vary, but generally every bolt on a header should be first fit snug, starting from the inside of the flange working out, so that the bolt connects
the flange to the manifold to the point where they barely touch. Second, using
the same inside-out pattern, tighten each bolt until finished. This method will
help prevent leakage and will give the user the best possible performance out of
their pair of headers. Below is the proper torque sequence for your particular set
of headers:


1.
Place vehicle in a location where the floor is solid and flat, with adequate
lighting. Do not attempt to work on a hot engine. Heat causes metal to
expand and makes removal of fasteners difficult at best. Disconnect the
battery cables from the battery. Raise the front of the vehicle to obtain
adequate access to the bottom exhaust manifold flanges. Use large-base
jack stands to support the vehicle. Do not rely on the jack! Block the tires
to prevent the vehicle from rolling off the jack stands.

2.
Spray WD-40 or some type of penetrating oil on all accessible fasteners
and fittings before attempting to remove them.

3.
From underneath the vehicle, loosen the clamps on the exhaust to H-Pipe
connection.

4.
Disconnect the rear O2 sensors, and the top O2 on the passenger side.
Unbolt and remove H-Pipe.

Driver side- 5.
Remove the lower bolt from the steering shaft coupler at the power
steering rack. Remove the bolt attaching the rack to the frame on the
drivers side. Loosen the same bolt on the passenger side. Slide the rack
forward on the drivers side approximately 1. Remove steering shaft
coupler from the rack.

6.
With the engine safely supported, remove the four bolts from the engine
mount, on the side of the block, to allow the engine to be raised.

7.
Raise the engine approximately 1. Remove the nuts attaching the
manifold to the cylinder head.

8.
Remove the factory manifold.

9.
Remove the exhaust manifold studs from the cylinder head. Remove the
dip-stick.
*NOTE-Some installers prefer to retain the stock studs. This is acceptable.

10.
Install the original gaskets, with high-temp, sensor safe RTV silicone
sealant placing two of the bolts in the top rear two holes. Install the new
JBA Header using the supplied bolts w/lock washers. Re-install the
dipstick. You will have to space the top mount away from the head using
the 3/8 spacer (nut) provided. Reconnect the steering coupler, move the
rack back into place. Replace the mounting bolt and tighten both bolts
securely. Lower engine, then replace mount bolts.

Passenger side-
11.
With the engine properly supported, remove the motor mount bolts
connecting it to the engine block to allow the engine to be raised.

12.
Raise the engine, unbolt and remove the manifold. Remove the bolts
attaching the starter, then swing starter out of the way.

13.
Remove the studs from head, (see note above) and then install the
original gaskets with high-temp, sensor safe RTV silicone sealant, placing
two bolts in the top rear two bolt holes.
14.
From underneath, slip the JBA header into place. Install with hardware
supplied. Lower engine. Replace the motor mount bolts, and tighten
securely.

15.
Re-connect the exhaust.

16.
Check to ensure that there is adequate clearance on all brake lines, wire
looms, A/C lines, etc.

17.
Reconnect the battery.

18. Re-check
everything!

19.
Start the engine, check for leaks and test drive. Then let engine cool and
then re-torque the header bolts.

20.
Periodically check and retighten the header bolts.
(4) 3/8 x 2.5 Collector bolts w/nuts &lock washers
(1) Dipstick tube spacer (3/8 nut)
*This product is designed to re-use the original manufacturer's gaskets'

Parts List:
(1) Driver s Side Header Assembly
(1) Passenger s Side Header Assembly
(16) 8mm Header fasteners w/lock washers
Other recommended parts:
JBA Axle-back exhaust system p/n 50-2627

For more information about this and other JBA products visit
www.jbaheaders.com
LIMITED LIFETIME WARRANTY
All products manufactured by JBA are guaranteed to be free from defects in materials and workmanship at
the time of sale. All products are guaranteed to fit the intended application, provided the vehicle has not
suffered structural damage or other modification*. Claims for damage occurring during shipment must be
made to the carrier. JBA, at its option, will repair or replace any product found to be defective in materials or
workmanship.
Failure of any JBA product while on the originally installed vehicle, will entitle the original purchaser to repair,
replacement, or pro rata credit according to the following chart:

Up to 2 years from the date of purchase
JBA will repair or replace at its option
After 2 years
JBA will allow credit of 50% of the current price

Certain uses or occurrences listed below will void this warranty.
PURCHASER ASSUMES RESPONSIBILITY: JBA expressly disclaims, and the purchaser expressly
assumes, responsibility for all labor related costs and any incidental or consequential damages arising from
any JBA product installation or failure. JBAs liability is limited to the purchase price of the product. JBA, at
its option, may refund the amount of the purchase to end a warranty claim. Labor charges incurred to install
or remove the product are not covered. Damage resulting from incorrect timing, fuel system problems,
clogged catalytic converters or backfire is not covered. Charges for the loss of use of vehicle, car rentals,
and towing are the responsibility of the customer and are not covered. Cost of customer-applied coatings is
not covered. As sound preference is subjective, sound is not warranted. Other than the warranty described
herein, JBA products are sold AS IS. No warranty terms are implied. The terms of this warranty are
severable. Any provision voided by state or other applicable law shall not act to enlarge other provisions of
this warranty except as expressly required by law. Catalytic converters and other products sold but not
manufactured by JBA are subject to the product manufacturers warranty only and are not warranted by
JBA.
THE FOLLOWING WILL VOID THIS WARRANTY: Use of heat-wrap products and/or the use of fuels
other than gasoline will void this warranty. Damage caused by improper installation is not covered under this
warranty. Damage caused by collision, road hazards, or failure of other components is not covered. Any
repair or alteration to a JBA product not performed by JBA or its authorized agents will void this warranty.
NO FREIGHT WARRANTY: JBA does not warrant freight. The purchaser will be responsible for freight to
and from JBA. Contact JBA to make a warranty claim and to receive a return authorization number. Return
the product freight prepaid along with a copy of the original purchase invoice and a written description of
the problem including the return authorization number to the address below. JBA does not accept freight-
collect shipments. A product found to be defective or otherwise covered under this warranty will be repaired
or replaced per the above policy and returned freight-collect.
JBA cannot assume responsibility for compliance