Installation Manual

409S® Stainless Steel
09/02/10
Removal:
1) Raise the vehicle up on a hoist or rack to working height and support securely with jack stands.
2) Remove existing system from the header collector or manifold down pipes back.
Installation:
1) On the frame, at the rear of the vehicle there are two holes that are punched into the frame on
either side of the vehicle. This is where hanger #202HA (left side) and hanger #203HA (right side)
must be mounted to support the rear of the tailpipe. If the car originally had single exhaust, the left
side will have two small dimples where the holes will need to be drilled with a 1/8” bit. Use the 1/4” x
1” self tapping screws to secure the two hangers into place. Then slide the rubber hanger #HA168
onto the two hangers. Note: See Page 3 of these instructions for helpful hints and possible
alternatives for securing these hangers.
2) On the underside of the vehicle slightly forward of the rear axle there are a pair of holes on
either side of the vehicle that will be used to mount the rear muffler hangers, #200HA (left side) and
#201HA (right side). Once mounted, the two hangers will point toward the center of the vehicle. Use
two 5/16” x 1” bolts to secure each hanger into place. If the car originally had single exhaust, in some
cases the right side will have small dimples where the holes will need to be drilled with a 1/8” bit. In
this case, use the 1/4” self tapping screws for the hanger.
3) After mounting the hangers into place, slide a #HA168 rubber hanger onto the hangers. Place
hanger #389HA into the bottom hole of the rubber hanger on the left side and into the bottom hole of
the rubber hanger on the right side of the vehicle. Both hangers will point toward the center of the
vehicle. See diagram on page 4.
4) Place right tailpipe #16145S over the rear axle and so that the rear of the tailpipe exits
between the quarter panel and the leaf spring. Do the same for the left tailpipe #16144S.
5) Install the left muffler #842546-Z by placing the outlet of the muffler into the clamp of hanger
#389HA, rotate the muffler so that it’s level and support with a stand. Tighten the clamp/hanger
enough to hold the muffler in place but still allow for adjustment. Repeat this step for the right muffler.
6) Install the front pipe assembly #16143S by placing the rear of the front pipe assembly into the
inlets of both mufflers and centering it in the drive line cavity. Support the front of the assembly with a
stand. Be sure the mufflers and front pipe assembly are level. Once the mufflers and front pipe
assembly are in place, check the hangers at the rear of the mufflers to see if they are hanging straight
down. Adjust front pipe and mufflers forward or back as needed to get the correct fit.
7) The #16149S front connector pipes are long enough to allow for many different header
Pg 1 of 4 Technical Support [phone]
Installation Instructions for:
SYSTEM #817129
1967-1968 CHEVROLET CAMARO/
PONTIAC FIREBIRD
V8 · EXCEPT CONVERTIBLE