If your vehicle has no any other modification that may affect and you ordered the right part # that system should be a bolt on easy to install.

My question would be, where was the OEM piping routed?

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My Ride: 1998 F150 4x4 Lariat Supercab Flareside 5.4L in Oxford White/gold, ORP, Tow Package, 3.55 Gears.

Modifications:
K&N FIPK
Gibson Supertruck Exhaust System
Stepshield door sill protectors
Performance Accesories 3" Body Lift
Superlift 3" lift blocks
Performance Lift Lips
Gabriel Gas Ryder LT VST Shocks
Daystar Front Anti-sway Bar Polyurethane Bushings
Heckethorn Steering Stabilizer
35x12.5R16.5LT BFG All Terrain KO's
16.5x9.75 American Eagle 589's.

Photos at: http://www.communicomgroup.com/jmtruck

 

I ordered and received a new in box Gibson Sweptside for my truck and took it to a local dealer to install. He stated my 1999 F 150 had some type of sub contractor towing package on it although it came with the truck new. Anyway, the exhaust system would not fit without major modifications. Has anyone ever heard of this?

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1999 F-150 Lariat SC 2 WD, White/Silver, 5.4L, 3.55LS, K & N FIPK, Superchip, underdrive pulley set, Dynomax Super Turbo Series Exhaust, six disc CD changer, towing package and captain chairs

 

My understanding, especaily with the Swept Side, was that is replaced the stock stuff and even used the existing hangers. I agree, maybe a wrong part number or, the guy didn't want to mess with it. I know a local shop here quoted me only $75 labor to install but wanted $150 more for the Swept Side that I'm getting it for on-line. Hmm, where are HIS margins coming from?

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2000 Eddie Bauer Expedition 4x2
Estate Green
5.4 ltr
3:55 LS rear
Tow Package
Superchip
Airaid FIPK
Rear Load Leveling
Moonroof
Century Child Seat!
Gibson Stainless Steel Swept Side Ordered and Backordered!