I wanted to put true duals coming out before the rear tire on each side. The custom muffler shop said I would lose 20% hp and torque and that he couldn't run it on the left side in front of the tire because of the gas tank being plastic and the exhaust would melt it. I dont think theres any validity to this. Lemme know what ya all think...

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98 Nascar Edition F-150 RC
4.6L,2wd,Auto,3.73

Future Mods:
Gibson Supertruck Exaust System
Airaid Intake System
Superchip


[This message has been edited by NacsarF150-1998 (edited 06-30-2000).]

 

"behind the front tires"???

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2000 F-150 XL,RC,LB,5.4,4R70W,3.55LS,
Class III tow/Payload #3/Convenience pkgs.,
4-wheel disc/ABS,Chestnut/Parchment 40/60,
Ford bedliner & gas/wheel/spare locks,
3" cold air box modification,Superchip,
Dynomax ultra-flow welded 3" cat-back.

 

I agree with the fuel tank issue. Even if it were a metal tank, I'd try to keep the exhaust away from it. Heat+fuel=bang! :O

As for the 20% power loss- he has no clue about how to design an exhaust system.


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1997 4x4 Expedition- 4.6L, true dual exhaust w/glass-packs, K&N air filter, SuperChip, airbox mods, Edelbrock shocks, 285/75R16 BFG ATs, 2000 "XLT" wheels, 4.10 gears, Auburn LS, Clarion In-dash CD player, Smitty Bilt push bars and nerf bars.

2000 4x2 F150 XLT Reg. Cab LWB- 5.4L, Tow Pkg, 3.55LS, CD player,Remote Keyless Entry, Sliding back glass, Special Appearance Pkg., tinted windows, Line-X bedliner, 285/60R16 Goodyear Eagle GT IIs and Prime #155 wheels.

http://members.visualcities.com/NoMo

 

Why not a big single?

Did you see https://www.f150online.com/f150board...ML/000221.html ?

 

actually, power loss is common on true duals with these trucks. the wide open, free flowing nature of the true duals kills ur back pressure drastically and it kills ur low end power (torque), though i hear it helps in the high ends because of its increased flow (sort of ironic).

that 20% figure i think is way off, personally, maybe like 5, possibly 10

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1999 Black F150 XLT Sport 4x4
Flareside
4.6 Triton V-8
Manual Transmission
Captains Chairs
Button-down Tonneau Cover
Webasto Sunroof
Spray-on Bed-liner
Xenon Fog and Headlights
Blackwidow Car Alarm

 

Above the muffler there is a heat shield, look at putting one between the gas tank and the pipe. Flowmaster makes a goodin Just a thought.

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'97 F-150 XLT Expidition front end (no idea why). 17inch 4x4 wheels with 32 inch tires flowmasters with tips, K&N filter, 5-spd, 4.2 V-6 bedliner, bright clearcoat red, stepside, hidden hitch, 3.55 gear ratio, tinted windows and a BIG reg ford sticker on the back window (my greatest joy is cutting people off who have calvin pissin on the ford sign and they HAVE to look at my big red sticker)