Installation Guide for FLOWMASTER models including: 717890 FlowFX Cat Back Exhaust System, 717890, FlowFX Cat Back Exhaust System, Cat Back Exhaust System, Exhaust System, System
Flowmaster 717890: FlowFX Cat-Back Exhaust System | Fits Select Chevy Silverado, GMC Sierra 1500 Trucks 6.2L (All Cabs) | 3.500 in. Inlet to Dual 2.500 in. Outlets | Connects to Factory Exhaust Tips | Dual Rear Exit | Flow FX Series Muffler | 409S Stainl - JEGS
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DocumentDocumentInstalla on Instruc ons 717890 2019 21 CHEVROLET SILVERADO 1500 & GMC SIERRA 1500 6.2L ENGINE 2/4 wheel drive & all wheelbases OVERVIEW: 1. Take a moment to read and understand these ITM # PART # DESCRIPTION QTY. instruc ons before installing your Flowmaster 1 36078M Inlet Pipe 1 performance system. 2 36065M Extension Pipe 1 NOTE: Please inventory all parts now before con nuing and if necessary, report any missing items to our tech line. This 3 72587-Z FlowFX Muffler 1 will avoid poten ally stranding your vehicle un l any missing 4 86546M Le Front Tailpipe 1 replacement parts arrive. 5 86547M Right Front Tailpipe 1 6 86548M Le Rear Tailpipe 1 7 86549M Right Rear Tailpipe 1 N/A PK1042 Hardware Pack includes: 1 8 MC350BS 3 / " Band Clamp 2 9 MC250BS 2 / " Band Clamp 4 10 HW503 / " Hanger Keeper 3 REMOVE FACTORY EXHAUST SYSTEM: 2. Raise vehicle up on a hoist or rack to working height. If you don't have access to a hoist or rack, support vehicle with jack stands. WARNING: Avoid serious burns! Allow your vehicle me to cool completely before touching any factory engine components. To ease prepara on and installa on of your new kit: · Apply penetra ng lubricant to mounts, bolts and clamps before you remove them. · Use stands as necessary to support parts as you detach them from your vehicle and again as you install new parts. Rev 02/03/22 www.flowmastermufflers.com Technical Support (866) 464-6553 Page 1 of 7 3. Remove bolts (x2) and disconnect driver side tailpipe from exhaust at flange connec on. 4. Remove bolt and mount securing driver side tailpipe then remove it from vehicle. Retain bolt and mount for later use. 5. Cut tailpipes just behind factory muffler. 717890 Rev 02/03/22 www.flowmastermufflers.com Technical Support (866) 464-6553 Page 2 of 7 6. Disassemble passenger side tailpipe wire hangers (x2) from isolators. Remove bolt and mount near outlet then remove assembly from vehicle. Retain bolt and mount for later use. 7. Loosen factory clamp from cataly c converter connec on to disconnect inlet pipe, disassemble wire hanger from isolator then remove muffler assembly completely from vehicle. 8. Release tab and remove factory clamp from pipe inlet. Retain factory clamp for later use. 717890 Rev 02/03/22 www.flowmastermufflers.com Technical Support (866) 464-6553 Page 3 of 7 INSTALL FLOWMASTER EXHAUST SYSTEM: 9. Remove nuts from stock and Flowmaster clamps, apply an -seize compound to bolts and re-install nuts. NOTE: The image in this step is intended for illustra ve purposes only and may or may not accurately reflect components included in your kit. 10. Place clamp (removed step 8) onto inlet pipe (1) then connect it to cataly c converter. Mount wire hanger into factory isolator and ghten clamp just enough to allow for adjustment. 1 NOTE: Complete this step only if your vehicle requires an extension pipe. Reference specifica ons below to verify. WHEEL BASE BODY STYLE BED LENGTH INLET ASSY: 148" Crew Cab 5.8' Inlet Pipe only 157" Crew Cab 6.6' Inlet+Extension 2 148" Double Cab 6.6' Inlet Pipe only 11. Place clamp (8) onto extension pipe (2) inlet then connect extension pipe to inlet pipe. 8 717890 Rev 02/03/22 www.flowmastermufflers.com Technical Support (866) 464-6553 Page 4 of 7 12. Place clamp (8) onto muffler (3) inlet. Place (x2) clamps (9) onto muffler outlets. Connect muffler to inlet or extension pipe then ghten front clamp just enough to allow for adjustment. 8 3 13. Route right front tailpipe (5) and le front tailpipe (4) over axle and connect them to muffler outlets. Mount wire hangers into isolators then ghten clamps (x2) enough to allow for adjustment. 4 5 14. Place clamp (9) and mount (removed step 6) onto right rear tailpipe (7) then connect it to right front tailpipe. Bolt mount onto frame then ghten clamp enough to allow for adjustment. 7 9 717890 Rev 02/03/22 www.flowmastermufflers.com Technical Support (866) 464-6553 9 Page 5 of 7 15. Place clamp (9) and mount (removed step 4) onto le rear tailpipe (6) then connect it to le front tailpipe. Bolt mount onto frame then ghten clamp enough to allow for adjustment. 9 6 16. Adjust exhaust components for fit; maintaining / " clearance and compensa ng for suspension, travel and vibra on then ghten all clamps. Finally, fit (x3) hanger keepers (10) onto each sideways hanger. NOTE: If your exhaust system s ll needs alignment, adjust isolator mounts in step 14 and 15. 17. Recommended: Secure slip-fit connec ons with a 1-inch tack weld then spray high-temp paint over each weld to prevent rust and premature corrosion. Congratula ons, the installa on of your FLOWMASTER performance exhaust system is now complete! 717890 Rev 02/03/22 www.flowmastermufflers.com Technical Support (866) 464-6553 Page 6 of 7 Installa on Diagram 717890 2019 21 CHEVROLET SILVERADO 1500 & GMC SIERRA 1500 6.2L ENGINE 2/4 wheel drive & all wheelbases 1 8 2 8 3 9 10 4 9 6 10 9 10 5 9 7 Rev 02/03/22 www.flowmastermufflers.com Technical Support (866) 464-6553 Page 7 of 7