I was doing some research on the idea of true duals for my truck and found out some yielding information. Besides the fact that having true duals would cause less low end power they would cause the cats to not fire properly because of excessive flow; thus causing the computer to think your truck is running way to lean and then pumping in more fuel then what is needed.

 

What exactly do you mean by true duals? Just the cats? Were did you get your info?

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99 F-150 Sport XLT Black x-cab 4.6L auto 3.55
K&N filter, dual series 40 flowmasters
Ground Force 2 in. rear drop

 

When I say true duals I mean true dual exauhst ; two mufflers.
I got the info straight from the gentlemen at Flowmaster.

 

lets get this straight-you(and the flowmaster guys) think true duals is a bad thing on our trucks.Maybe you and the gentelmen need to talk with "Neal the H.P. Freak".He is in fact running true duals with 2 2&1/2 inch pipes that go to 2 flowmaster 3 chamber mufflers that have 3 inch tips.Currently he is running 14.53 in the 1/4 mile.He has 332 hp at the flywheel and is not supercharged.I say he is not because his #s are close to a stock lightning>They usually run between 13.9 and 14.4 stock and they are blown by a supercharger.You can read alot about him(his mods to his truck) in the computerchips forum.Apparently as long as you keep the pipe size down it is ok.

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2000 f150 4x4 sport,black, 3.55 5spd ,4.2 liters of fury ------mods----pioneer cd,alpine sub,cadence ultradrive amps,alpine mids&tweets,Delta tool box,class III reciever hitch,herculiner bed liner,taz floor mats,profile bug guard,custom painted tail light covers,headlight covers,cranked torsion bars,pirelli scorpion at(265/75 16), modified air box(crash1 style),JET air filter,blue cargo lights


www.lightningcrashz@hotmail.com

 

On the subject of power loss I have not felt any, but that may be cause of all my mods. The pumping too much fuel is not true! When I was going to school(college) I was enroled in the auto program. I played around with all the equipment including the fuel ratio tester. Which as all veichles that are computer controlled fluxes back and fourth from lean to rich. The over all ratio that my truck was running was apx 14.7 parts air to 1 part fuel. WHERE IT SHOULD BE. And for your info I am running true duals 2.25 pipe and two magnaflows.

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99 F-150 4.2L
True duals W/Magnaflows
Jacobs Ignition
K&N filtercharger
Custom programed chip
throttle body spacer
ported&polished throttle body
ported mass air flow sensor
Black Magic electric fan
Belltech rear sway bar
belltech 3/4 drop

 

332 at the flywheel from a V-6???
Neal, will you just touch my engine, please? WOW I need to get busy with my mods, Neal you need to write a Tech How to on what works and what doesn't Granted I'm a 4x4 wanting Tourque and not dragstrip numbers but power is power baby!!!!

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Y2K F150 4x4 XL Med Torredor Red
4.2 5 speed,AIRAID, SuperCHIP,
3.55 LS, Leer camper shell, bedrug,
Ranchhand Rover Brushguard 2X Off road lights
Tint/alarm/ aftermarket keyless entry/locks
2m radio, CB, 3 Scanners
regulator@f150driver.com

 

I asked my local performance shop regarding exhausts systems and he said if you are looking for the most HP possible you will need to go true duels (complete separate exhausts from each head). Also I go my quote for my TRUE DUEL system using FM 50 series. No Tips (stainlees) included $385.00 come with a Lifetime guarantee, all welded seams, joints and hangers.



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2000 Navigator. Laser Red, Every option. ,FIPK (mods), Superchip, Rear air deflector, Bug deflector, PIAA, headlights (SUPERWHITE)

Looking at Hitting 400 Hp without a blower. Using in addition, headers and duel CatBack. (If possible)
(Waiting for JBA to develope Headers)

“91” F150 4X4 Shorty “Ultimate Off Road Edition” Borge Warner T18 4 speed, Traction Lock Front and Rear Differentials., Smitty Built Duel Tube Roll Bar, Moog Super Off Road Coil Springs, Factory 2” Lift Rancho RS 9000 Shocks , Stock Front “QUAD SETUP” 33x12.5 (B.F. Goodrich) Mud Terrain Warn Winch Combo Bush Bar with Warn XD9000I Winch. Full Factory Skid Plates. 302 Long Block, K&N FIPK JBA Chrome Headers, Custom Catback using Flowmaster Muffler, Duel out side behind rear wheel.

 

I am regret to inform you that neal has the 5.4.Still very impressive for a non supercharged truck.It would be truly amazing for our v-6 to put those kind of #s up.

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2000 f150 4x4 sport,black, 3.55 5spd ,4.2 liters of fury ------mods----pioneer cd,alpine sub,cadence ultradrive amps,alpine mids&tweets,Delta tool box,class III reciever hitch,herculiner bed liner,taz floor mats,profile bug guard,custom painted tail light covers,headlight covers,cranked torsion bars,pirelli scorpion at(265/75 16), modified air box(crash1 style),JET air filter,blue cargo lights


www.lightningcrashz@hotmail.com

 

True duals are fine if you link then together with an X-pipe or balance pipe between the two. These crossover pipes help scavenge the the leftover gases out of the cylinders to create more low end power. It also takes care of any richness problem because these leftover gases are what jack with the computer. I know this from experience. I had a truck that ran rich with unconnected duals and when a balance pipe was installed the problem went away.

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Later,

Chuck
Black 00
http://home.midsouth.rr.com/lightningpage

 

True duals or a single can be properly sized to create the wanted power range. A single is cheaper, easier, and can be sized to outflow most power combinations; it's just preference.

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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,
3" exit Y-pipe, Hellwig rear anti-sway bar,
Rancho RS9000s.

 

I love my true duals,I have a balance pipe installed. I got my first rubber after installing them and,other than the car transport idiots breaking my hangers,I have had no other problems.
If you go too big on your pipes,then you'll
have low end power loss. I have 2 1/4" pipes and I'm thinking about switching to
Hooker Aerochambers and 2 1/2" pipes.
Long live the HP Freak!!! ,,,,,,,98

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98 F-150 4.6 Litre XLT2wd Ext. cab
prarie tan/tan int.
K/N gen.II fipk
custom dual exh/gibson rectangle tips/rear exiting.
color matched snuglid
Superchip!!!
Westin nerfs blk .powdercoat
Clear front corners
Clear Euro tails(Altezza style)
Cobra 75WXST cb w/weather alert
Kenwood cd w/Radio Shack speakers,don't laugh it sounds pretty good
Viper 500HF Security system
On the way/wheels,tires,air dam, etc..etc.......
doin the monochromatic boogie
on the front end.Billet grilles on order www.my-f150.com .still want to lift it,YES!
Fender Guitars,ROCK!!!
http://www.bigsandy.net
officialtomwaits.com
reverendhortonheat.com



[This message has been edited by 98SCREAMER (edited 11-11-2000).]

 

SAY WHAT?!!!!!!!!!!!! i dont know whos smokein more crack the flowmaster guy or u for believein him. No offense what so ever man but there is no comparison to havin true duals! ill bet money on it. i put my truck on before and after i put duals and that fm guy is blowin smoke in ya pipe. i gained 12.6hp just by puttin true dual straight pipes 2 1/2" double piped at the back corners with 3" tips. now believe the guy if u want but i have seen some of the hp gains from a 2in/1out system and they r advertisin these false gains of power to make M O N E Y!
common sense moment if u dont mind please?! think of this 4 exhaust ports 1 pipe? pretty free flow right? 4 exhaust ports 1 pipe + 4 exhaust ports 1 pipe into 1 SLIGHTLY bigger pipe? come on aint happenin! the engine has to work harder to push 4+4 into 1. rather than 4 into 1 on each side, make sense? thought so. happy huntin ford15098

 

Just my 2 cents.....

Single or dual. Headers or not. Side or rear exit. Etc, etc. etc.....

Exhaust systems may not be rocket science, but it's not as simple as "bigger is better" either. The ultimate exhaust would "tune" the exhaust wave pulses to allow minimal restriction with no excessive backpressure.

Done properly a single can produce just as much streetable power from our modestly modified motors.

Duals, especially when used in conjunction with small high flowing mufflers, are great for top end power, but usually at the cost of some low end.

So, if you drive your truck hard all the time, you might be happier with duals. If you spend more time pulling a trailer in traffic a quality single exit might be better suited.

Just like everything else on our trucks, everyone has a different preference at times...

 

I couldn't be happier with my setup; I've got a '98 F150 4.6 with true duals, 2.25 pipes, 30 inch glasspacks, and love the sound and performance. Tried it with and without the balance tube, and with is the only way to go. It gives better throttle response all the way through the power band, a more balanced sound, and holds OD longer while going up hills, and seems to have more power than without the balance or "E" tube. I called the muffler guy and recommended he not install true duals without it!