Installation Instructions for JBA Performance Exhaust 1685S Cat4Ward Headers

Quick guide from the manual

This document provides installation instructions for the JBA 1685S Cat4Ward Headers on 2011-2014 Mustang 5.0 vehicles. Installation is time-consuming due to tight working areas. Ensure you have an E8 External Torx socket before beginning. Always work on a lift or use quality jack stands on level ground.

Parts List

• Driver’s Side Header Assembly
• Passenger’s Side Header Assembly
• Header flange gaskets
• 16x 10mm-1.5 header bolts
• 16x 10mm-1.25 header bolts
• 16x Header Bolt Washers
• CARB EO Sticker

Preparation

Before starting the installation, allow the vehicle to cool completely. Disconnect the battery. Spray penetrating oil on all hardware and fittings that need to be removed. Clean the sealing surface on the head of any old gasket debris or carbon build-up.

Installation - Driver's Side

1. Remove the steering shaft from the U-Joint on the steering rack.
2. Place a jack under the oil pan using a block of wood to spread the load. Lightly jack up the motor to remove weight from the motor mounts.
3. Unbolt the large nut in the center of the motor mount from the top.
4. From below, remove the 4 bolts holding the Aluminum motor mount stand to the engine block.
5. Jack the motor up about 2-3 inches and remove the Aluminum motor mount stand.
6. Unplug the O2 sensors.
7. Remove the nuts holding the stock exhaust manifolds to the cylinder heads.
8. Remove the manifold studs from the head using an E8 External Torx socket.
9. Remove the O2 sensor from the stock manifold and install it into the JBA header using a small amount of anti-seize.
10. Slip the supplied exhaust gasket into place and install the new JBA Header using the supplied bolts and washers. Important: Ford used two different thread pitches on the cylinder heads. Compare the supplied header bolts to your original studs to avoid stripping the heads.
11. Tighten fasteners in an alternating sequence.
12. Reinstall the motor mount stand, lower the motor, tighten all bolts, and reinstall the steering shaft.

Installation - Passenger's Side

1. Remove the starter motor.
2. Follow the same procedure as the driver's side for motor mounts and manifold removal.
3. Install the JBA header.
4. Re-install the starter, lower the engine, and tighten the lower mount bolts.
5. Reinstall the factory catalytic converters using the original gaskets.
6. Plug all 4 O2 sensors back in.
7. Check to ensure adequate clearance on all brake lines, wire looms, and A/C lines.
8. Reconnect the battery.

Post-Installation

Start the engine and check for leaks. Take the vehicle for a test drive. Once the engine has cooled, re-torque the header bolts. Periodically check and retighten the header bolts as part of routine maintenance.

Warranty and Compliance

This product is 50-state legal when installed on the specified vehicle per the manufacturer's application guide. The CARB EO sticker must be installed in a readily visible underhood location. The JBA Limited Warranty covers defects in materials and workmanship for one year to the original purchaser.