IN RESPONSE TO TRUE DUAL SYSTEMS. THE REASON THAY ARE NOT ALL WHAT THEY SEEM IS THEY RELIVES TO MUCH BACK PRESSURE AND CAN HURT YOUR LOW END PERFORMANCE, ALSO CAN RUIN YOUR EGR VALVE AND VOID YOUR FACTORY WARRANTY BECAUSE ALL NEW AGE MOTORS REQUIRE A CERTIAN AMOUNT OF BACK PRESSUE NOT LIKE THE OLD HOT RODS THAT WERE JUST A BLOCK CARB AND EXHAUST THERE WAS NO SMOG OR COMPUTER B.S. TO DEAL WITH BUT NOW IT CAN REALLY HURT YOUR MOTOR IN THE LONG RUN.THIS WAS ALSO THE TOPIC IN THE DECEMBER ISUE OF SPORT TRUCK "THE TRUTH ABOUT TRUCK PERFORMANCE" "MORE PERFORMANCE WILL BE GAINED WITH A LARGER DIAMITER SINGE SET UP"

 

Has anybody with true duals on thier trucks had any of the above problems?

 

Supertraps are the answer. They are a little more expensive than some other mufflers, but they fit on the end of your exhaust pipes and look closed, but the flow is straight thru the muffler.

They look closed becuase it has disks that mount inside the tip of the muffler. They are tunable mufflers... you can remove disks for less backpressure and more low end torque or you can add disks back to decreas backpressure the desired amount and increase the sound.

And they have great sound

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Chris Thomas
1998 F-150XLT Flareside STX Sport Package, 4.6L Auto 3.55 Oxford White/Gray interior, Factory Anti-theft system
Picture: http://216.147.104.171/Y2K/members/ChrisT/christ1a.jpg
Homepage: Chris & Brandi's Universe
Mods: A.R.E. Decklid/Oxford White with gray fabric liner, K&N filter with Airbox Mod (removed silencer), Tinted Windows, GTS sloted taillight covers (painted Oxford white to match), Removed STX stickers
Audio: Kenwood Truck speakers with 10" woofers, Rockford Fosgate and Alpine Amps, Ford 10 disk CD changer
Future Mods: 3/4 Lowering Kit (Maybe 4/6 if I don't have to change tires at the same time), 20" rims and tires, True duals with Supertrap tunable mufflers, Superchip, Supercharger, Jacobs Ignition, NOS, and whatever else I can think of!!!



[This message has been edited by Chris Thomas (edited 02-07-2000).]

 

using all caps is hard to read and is also like yelling please use normal text. I agree to large of tube cause loos of low end

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2000 blk xlt f150 sc 4x4 orp pkg 5.4 3.55 ls tow pkg herculiner ,sony 10 disc cd-player A.R.E. cap remote start

 

I too will agree that it is POSSIBLE for true duals to relieve too much backpressure. I experienced a loss of low-end power when I had them and glasspacks installed on the Expedition. A more restrictive set of mufflers would help regain the torque lost in the 1000-2000 rpm range.

As for the EGR and other "problems", I've not had a single issue in the two years that the duals have been installed. It's even been in for warranty work (nothing engine related) and has passed 3 state (OKLA) emissions inspections. I suspect that the catalytic converters provide enough backpressure to prevent any engine problems.

Neal

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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, Optima "T-Bone" wheels, 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.

http://members.visualcities.com/NoMo