Flowmaster FORCE II 817526 Installation Instructions Manual

409S Stainless Steel
®
1) Begin by spraying a penetrating lubricant onto the front flange bolts behind the catalytic converter. Also
spray the rubber hangers that support the factory exhaust system. At the rear of the vehicle, support the
muffler with a stand and then using a hacksaw or sawzall, cut the tailpipe in front of the muffler just after the
over-axle bend. Remove the hangers on either end of the muffler from the rubber mounts on the vehicle and
lower the muffler from the vehicle.
Pg 1 of 3
2) At the front of the vehicle, support the resonator in the center of the vehicle
with a stand. Then using a 15mm socket, loosen the bolts at the front flange
connection behind the catalytic converter. Remove the hanger just behind the flange
connection as well as the one at the rear of the resonator. Lower this front section
from the vehicle.
3) Place inlet pipe #26354S into position behind the front flange and connect the
hanger on the pipe to the rubber mount on the vehicle. Then connect the two flanges
together and use the supplied 3/8" bolts, nuts and washers to secure the two
together. Be sure to square up the two flanges to each other and tighten enough to
hold but still allow for adjustment.
4) Place the provided 3" clamp onto the muffler inlet then slide onto the back of
the inlet pipe. Support the muffler with a stand and tighten the clamp enough to hold
but still allow for adjustment.
5) Place a provided 2½" clamp onto the right muffler outlet. Place tailpipe
#16715S into position over the rear axle and into the right muffler outlet. Connect the
hanger at the rear of the tailpipe to the rubber mount on the vehicle. Tighten the
clamp on the outlet enough to hold but still allow for adjustment.
Technical Support (800) 544-4761
Installation Instructions
SYSTEM #817526
2006-2010 HUMMER H3
3.5L & 3.7L Engine
11/30/11