Read all instructions before starting any work. This kit is designed to connect to DynoMax Blackjack painted or Cyclone Ceramic coated, or competitive brand, full length Headers.
1. Position the Thrush muffler 704093 behind the rear axle in the stock location and support with a floor jack.
2. Install the intermediate pipes, 704089 RH and 704090 LH, into the muffler inlet connections. See the system diagram for muffler inlet locations. (NOTE: The muffler can be installed with any set of connections as the inlet or outlet.) Finger tighten the 2đ⁄₂” clamps that secure each pipe to the muffler inlet connections.
3. Install the 704088 h-pipe into the intermediate pipes and tighten 2đ⁄₂” clamps enough to hold the pipes in place but still allow adjustments. Temporarily support these pipes.
4. Install reducer adapters 703094, flanges 160771, and gaskets 160401 onto the header collectors and attach with the ģ⁄₈” nuts, lock washers, and bolts provided.
5. Hold the front header extension pipe 704087 up to the reducer adapters and the h-pipe704088. Measure the extension pipes for possible cut-off. You may need to cut-off on each end for best fit. Once the cut-offs have been made, clamp the extension pipes to the reducer adapters and h-pipe. You may need to remove the reducer adapters from the headers to insert the extension pipes and clamp properly. Support these pipes with jack stands or similar supports. Please see the system diagram.
6. Make sure the muffler is now centered tin the area behind the rear axle.
7. Position a 35819 hanger above each intermediate pipe (704089 RH & 704090 LH) just before the bend that starts up over the rear axle. Lightly clamp these to each pipe so that you can locate the holes to be drilled into the floor pan to secure hangers.
8. Raise the muffler and pipes up until the hanger rubber pieces make contact with the bottom of the floor pan. The two rubber pieces of the hanger must be folded together so that the two holes line up. Use the flat metal plate and place this on top of the rubber pieces for reinforcement. Mark the location of the holes with a center punch.
9. Drill out the holes using a ⁵⁄₁₆” drill. You will want to remove the back seat so that you can get to the hole locations. Attach the hangers with the bolts, lock washers, and hex nuts provided.

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