Matt:
I'm thinking about the same system for my 5.4L next spring. The flowmaster kit, #17222, comes with a 50 series SUV-Performance muffler, #530562, according to a rep from Flowmaster. This muffler has a single offset 3" diam inlet, and two 2-1/2" diam outlets. I just helped a friend install a very similar system on his 5.2L 97 Dodge Ram. In his kit, there is a short adaptor piece that that bumps the primary pipe size up to 3" where it enters the muffler. I don't know how it affects low end torque, but it's one of the sweetest exhaust notes I've heard, and reasonable noise levels inside the cab. Hope this helps.....

Selva1


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2000 XLT Black Sport, Flareside, 2WD, Ext. Cab, 5.4L Auto. Other factory options: 3.55 LS, Class III tow, 6-way Captains chairs w/CD changer, Remote entry , and Slider window. Mods: Undercoat, window tint, headlight & tail light covers, removed "Sport" decals, upgraded Triton tailgate emblem, and a Linex spray-in bedliner. Wish list: ARE LSII lid, Flowmaster duals, K&N FIPK, and a Belltech 3/4 drop.

 

I am considering a catback exhaust system for my 99' F150 5.4L V8 and I am looking at FlowMaster's Force II (dual rear out)system. I was hoping someone might be able to tell me the diameters of both the inlet pipe and the two outlet pipes. I checked FlowMaster's web page, but I could find any info about this. My only real concern about this system is the possibility of losing some low-end torque, so I'm wondering how large the outlet pipes are. If anyone has this system on a 5.4L V8, I would also like to hear any pros and/or cons about it. Thanks for any info on this!

Matt


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99 F150 X-Cab 4x4 SB, 5.4L V8, Deep Wedgewood Blue/Dark Graphite, ORP, 3.73 LS, Tow Pkg, Captain's Chairs, AIRAID, Luvernve Stainless Nerf Bars, Lund Frontrunner bug deflector, Lund Eclipse taillight covers, Lund Eclipse side rear window shades,

Sony Mobile ES CDX-C7850 head unit, Sony Mobile ES XDP-U50D DSP, Sony MDX-65 MiniDisc changer, Rockford Fosgate Punch 600a5 amp, Infinity Kappa 62.1i's in the rear and Kappa 63.1i's in the front, 2 Rockford Fosgate 8" Punch XLC subs under the rear seat in sealed boxes.

Soon to be added: RamAir styled hood to replace my hail-damaged stock hood.

 

Correct me if I am wrong but I do not think you can reduce backpressure and get an increase in torque. I think that claim is contradictory. It is my understanding that increased flow (AKA performance) = reduced torque. You can't get both. You have to give some of one up for some of the other. The eternal compromise. But what the heck if it sounds good that's what really matters!

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97 F-150 SC Lariat, Styleside, White over Gold, 4.6L (Windsor), Automatic, 3.55 rear end, electronic 4X4, w/ every option of Lariat and ORP packages except the 17" wheels and the 4X4 decals, MODs so far: K&N air box mod, Gibson Super Truck, clear Bugflector II, Leer TSC 600 hard cover, Bridgestone Dueler OWL ATP 265/75 R-16's, TrailMaster Invader N7 shocks, Smittybilt step bars, Ford moulded mud guards, "White-white" head lamps.

 

I am also looking into this setup for my 2000 Lariat 4X4 with the 5.4. I called the folks at Flowmaster for info:
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1998-99 Ford F150
4.6L & 5.4L Models

FLOWMASTER FORCE II System
Dual Out System, Side Exit Stainless Tips

Part # 17226

Flowmaster Now Offers A Complete Bolt-In Dual Outlet Force II Style System For The 1998 Full Size F150 Trucks Featuring Stainless Steel Exhaust Tips.

PRODUCT FEATURES:

• FULLY ALUMINIZED STEEL CONSTRUCTION.

• FITS 4.6L & 5.4L ENGINE TRUCKS.

• FITS TWO & FOUR WHEEL DRIVE TRUCKS.

• SYSTEM FITS 117", 133", & 139" WHEEL BASES

• DUAL OUTLET SPLIT TAILPIPES THAT FIT AROUND THE SPARE TIRE AND FACTORY HITCH LOCATIONS.

• Side exit behind rear wheels location with polished angle-cut stainless exhaust tips

• NO NEED TO RELOCATE SPARE TIRE.

• SPECIALLY DESIGNED 50-SERIES SUV/Performance MUFFLER WITH DUAL OUTLETS FOR A MILD EXHAUST TONE.


PRODUCT BENEFITS:

• ALUMINIZED STEEL FOR EXTENDED PRODUCT LIFE.

• SPLIT side EXIT DUAL 2 1/2" TAILPIPES behind rear wheels FOR a SPORT TRUCK DUAL EXHAUST LOOK.

• REDUCED BACKPRESSURE FOR ADDED PERFORMANCE AND TORQUE.

• STOCK FACTORY STYLE HANGERS FOR EASY INSTALLATION.

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The dude quoted a MSRP of $428.00. I assume that it is available for less than that on the internet. If anyone finds it for less, please post the URL. It seems like a nice kit, but it is not available in stainless to my knowledge. The Force II's come with a special "SUV/TRUCK" version of the 50 series muffler that is supposed to have little effect on engine torque due to reduced back pressure (according to their support dude).

Has anyone installed one of these yet?

Steve


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2000 4X4 Lariat Styleside
All options except LS rear


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