JBA 40-1509 User Manual

Installation Instructions

and Warranty Information

2007-2008 Jeep Wrangler JK

Part Number 40-1509

Read all instructions carefully before attempting installation.

Installation instructions for JBA Evol Exhaust P/N 40-1509

2007-2008 Jeep Wrangler JK

NOTE: Installation of this product requires an adequate workspace, general mechanic’s 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. Allow vehicle, and exhaust pipes to cool down.

1. Lubricate all rubber isolators and hangers.

2. Disconnect negative battery cable and allow vehicle exhaust to cool

3. Lubricate all rubber isolators and hangers.

4. Loosen clamp just before muffler assembly

5. Using a muffler stand or another person to hold the muffler assembly in place, remove the
hangers from the rubber isolators and the muffler assembly from the vehicle

6. Position JBA muffler assembly in its place, reattaching factory rubber isolators into hangers.

7. Place clamp over the expanded end of the muffler assembly and fit the pipe over the factory
intermediate pipe.