Flowmaster AMERICAN THUNDER 817725 User Manual

409S® Stainless Steel
02/18/15
Removal:
1) Raise the vehicle up on a hoist or rack to working height. If you do not have access to a hoist
or rack, raise the vehicle and support securely with jack stands.
2) Begin by applying a lubricant to each of the rubber exhaust isolators as well as the two front
flange bolts. This will make the removal and installation process much easier.
3) Support the muffler with a stand and remove the two bolts
at the front flange connection. Now, with the help of an assistant,
slide the exhaust system to the rear to disengage the hangers on
the exhaust from the rubber mounts on the vehicle. Once free,
the assembly can be removed by working it forward over the rear
axle (If you are working on the ground it may be easier to cut the
tailpipe off at the rear of the muffler to simplify removal).
Installation:
1) Mount the left rear tailpipe hanger bracket #226HA to the
frame on the driver’s side of the vehicle. Place the included 3/8 x
3.50” bolt thru the 226HA hanger and into the hole indicated in
the photo. On the inside of the frame, place the HA226 back-up
plate over the bolt followed by a flat washer, lock washer and
nut. Using two 9/16” wrenches tighten firmly (Do not over
tighten).
Pg 1 of 4 Technical Support (707) 544-4761
Installation Instructions for:
SYSTEM #817725
2015 FORD F-150 TRUCK
2.7L, 3.5L & 5.0L ENGINE
Does not fit Standard Cab – 6.5’ Bed

Flowmaster AMERICAN THUNDER 817725 Specifications

General

Brand	Flowmaster
Model	AMERICAN THUNDER 817725
Category	Other
Language	English

Summary

Exhaust System Removal Procedure

Vehicle Lifting and Support

Raise vehicle securely on a hoist, rack, or with jack stands to working height.

Lubrication for Easier Removal

Apply lubricant to rubber exhaust isolators and front flange bolts to ease removal.

Exhaust System Detachment Steps

Support muffler, remove front flange bolts, and slide system rearward to disengage hangers.

Exhaust System Installation Guide

Left Rear Tailpipe Hanger Bracket Mounting

Mount the left rear tailpipe hanger bracket to the frame using the provided bolt and back-up plate.

Inlet Pipe Selection Based on Vehicle

Select the correct front inlet pipe based on vehicle cab, bed length, and wheelbase variations.

Front Inlet Pipe Connection to OEM

Connect the inlet pipe to the existing OEM head pipe using provided hardware, allowing for adjustment.

Inlet Hanger and Muffler Attachment

Install inlet hanger and attach muffler inlet pipe, ensuring proper fitment for adjustment.

Right Side Tailpipe Installation

Position and connect the right side tailpipe to the muffler outlet and attach its hanger.

Left Side Front Tailpipe Installation

Connect the front section of the left side tailpipe to the muffler outlet and attach its hanger.

Left Side Rear Tailpipe Installation

Connect the left rear tailpipe section to the front section and attach its hanger.

Exit Pipes and Tip Positioning

Attach side or rear exit pipes and stainless tips, positioning them for final adjustment.

Final System Fitment and Tightening

Adjust all components for proper fitment and clearance, then securely tighten all clamps.

Hanger Keeper Installation

Install 7/16" hanger keepers onto left tailpipe hangers to prevent rod slippage.