Installation Manual

409S ® Stainless Steel
Installation diagram for:
SYSTEM #817460
2005-2010 FORD MUSTANG V-8
INCLUDES CALIFORNIA SPECIAL AND GT500
11/07/11
Removal:
1) Use a 15mm socket to loosen the nuts on the clamped connection between the mufflers and the
over-axle pipe. Then use a 13mm socket to remove the bolts that secure the muffler hangers to the
frame of the vehicle. There are two hangers on each side of the vehicle. These hangers must be
removed to allow removal of the stock mufflers. After taking the hangers down, slide the muffler off o
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the over axle pipe and set the muffler aside. Take the hanger mounts off of the stock muffler and put
them onto the Flowmaster mufflers.
Installation:
1) Before installing anything, prep the clamps supplied in the hardware kit by removing the nuts,
and applying a thick lubricant such as white grease or anti-seize to the threads.
2) Place one of the supplied #MC250BS clamps onto the inlet pipe of the right muffler #842548-
241. Slide the muffler onto the over-axle pipe, support with a stand. Place the hanger mounts bac
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into position on the frame and reinstall the factory bolts. A 13mm open end wrench will be needed to
reach the bolts above the muffler. Level the muffler and tighten the clamp on the muffler inlet enough
to hold but still allow for adjustment. Repeat the step for the left muffler.
3) Adjust the position of the mufflers to provide a satisfactory fit. A minimum of 1/2 clearance
around all parts of the system must be maintained; while keeping suspension travel and vibration in
mind. After adjustments have been made, securely tighten all clamps.
NOTE: IF ONE OF MORE OF THE TIPS ARE NOT PROPERLY ALIGNED.
Due to variance in the factory H-pipe location you may need to adjust the H-pipe by loosening the two
front factory clamps (at the H-pipe) and the two clamps at the muffler thus giving you the ability to
achieve satisfactory fit and placement of the Flowmaster mufflers and placement of the tips in the
factory cut-outs.
4) For a more secure installation, we recommend welding all slip-fit connections.
Technical Support [phone]
PACKING LIST
Qty Description Part #
1 Muffler (R) 842548-241
1 Muffler (L) 842548-242
1 Hardware Kit PK509
2 2.5” Clamp MC250BS