Anyone done true duals with an h pipe? Meaning, a separate pipe from each cat and a muffler on each pipe with a pipe after the cats between the two separate pipes for balance?

Does it rob too much low end torque? Were there any benefits noted over say, just a single muffler catback (single in, double out)?

Your input is appreciated. Thanks.

 

JustCuz, Dual exhausts (true duals) means 2 exhaust pipes, 2 mufflers, and 2 tail pipes,
When done properly you'll have a "H" pipe put in about a foot in front of the mufflers, they are welded onto each exhaust pipes, some use same diameter pipe, but i use 2 " welded onto my 2 1/2" exhaust pipes.
Pick out your favorite mufflers and decide where you want your tail pipes to run out, rear bumper, behind rear wheels, etc.
Use a good muffler shop and make sure they use aluminized (sp) pipe, it won't rust and it makes nice bends, so your duals will look good, (if you crawl under your truck to check them out.)
Most exhaust shops will put "H" pipes on, cause they equalize the back preasure on your engine exhaust, watch out for shops that charge a arm and a leg to make up a H pipe.
If they have to order them,(H pipe) find another muffler shop,good arc welders love to put pieces together...........Dogcam




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dogcam@myf150.com
97 Lariat s/c 4x2 5.4
all mods off, turning it
in for a new 00

 

Hey Dogcam:

Thanks for the input. Have you done this? Can you tell me what difference it made? Did you lose a bunch in the low end? Is it too free flowing?

I am trying to decide on the true dual set up or a single/double in, double out catback system like flowmaster or gibson. If I won't lose too much low end torque, I would prefer the true duals.

Thanks and happy truckin!

 

JustCuz: If you haven't already, check out our discussion under the topic "Which To Buy, Gibson or Flowmaster" towards the bottom of the posts. I had a true dual system installed in my 4x4 last weekend, and although I didn't have the H pipe installed, I am very happy with the sound and performance level.

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1999 F-150 4x4 SuperCab, Deep Wedgewood Blue, ORP, 4-Wheel ABS, Loaded, Flowmaster 50 series, K&N, Tint, Westin Nerf Bars, Pioneer DEH-P3000.

 

Hey Indigo, I see you have Flowmasters 50s,and you said there true duals.without the "H" pipe?
Flowmaster highly advises using a H pipe on their dual exhaust systems, check out their website, it will tell you what they say about H pipes.Also have it in their booklet too.
I wouldn't have any dual system put on without using a H pipe.
I've always used them and will have one put on my new 00.
Dogcam

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dogcam@myf150.com
97 Lariat s/c 4x2 5.4
all mods off, turning it
in for a new 00

 

JustCuz, to answer your question, my last post tells you if I would or should.
Your other question on torque, i've always have had the biggest HP motor you can get in all my vechiles and maybe you loose abit of torque, but letting the engine run up to its full potential, make up for it.
Another thing, just cause add ons with big price tags, don't always make for a better performance,
I use Dynamax mufflers, the off set with 2 and a half inch diameter inlets and outlets, aluminized pipe from the cats, all the way to the tips.
My 00 4x2 I am putting on 22 " long 3.5 diameter chrome tips 30 degree angles at the ends right out behind the rear wheels, so all you see is big 3.5 diameter chrome exhausts on a angle .....Dogcam

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dogcam@myf150.com
97 Lariat s/c 4x2 5.4
all mods off, turning it
in for a new 00

 

Hey Everyone, Thanks for the advice. I decided to go with the true duals, no h-pipe per advice of reputable shop (doesn't matter because the exhaust exit is balanced all the way to the cat's and past that is just through the muffler and exit tips). The shop I am using is mandrel bending the pipe, 2.5" and using two Dynomax Super Turbo muffler's.

Anyone got any good or bad to say about the Super Turbo mufflers?

Thanks for the help!

 

Oh yeah, its costing me $265, including the mufflers! Not bad if you ask me.

 

There's an exhaust article in one of the Peterson's OFF-ROAD magazines. The October issue. I'll try to remember to get all the info tonight, but the jest of the "H" pipe section was that they lost a small amount of torque throughout the rpm range. The largest "loss" came at peak torque. However, they went on to recommend an H-pipe- just because it sounds better!!

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, and Clarion In-dash CD player.

1993 4x2 F150 Reg. Cab LWB- 5.0L, cat-back dual exhaust w/glass-packs, K&N air filter, Superchip, fresh paint, and Line-X bedliner.
http://members.visualcities.com/NoMo

 

JustCuz: I had a 2.5 inch cat-back Dynomax system installed on a 5.0 Mustang years ago and they resonated considerably, but then all 5.0's resonate with aftermarket mufflers. I'd like to know how the SuperTurbo's sound on your truck. I priced a 2.5" drue dual system for my 99 F-150 with Flowmasters and it was almost double what you are paying. Too rich for me. The muffler guy said that the Dynomax mufflers were considerably cheaper. By the way, what engine do you have?

 

Stephen_T:

I backed out of the true duals at the last minute. Heard too many people got the true duals and ended up going to a catback of some sort, either split rear or single. They lost too much low end torque with true duals.

I decided on a split rear catback with a Magnaflow muffler, 3" single in, 2.5" inside the muffler (two chamber, basically straight through muffler). Installed it for the same price labor but the muffler was about $20 more than a single Dynomax so I ended up paying $200 out the door. Sounds great! Does resonate slighly at around 1800-2000 rpm, but smooths out quickly and not much interior noise at all after that spot in the rpm band.

I definately noticed a pickup in low end torque. Used to have to drive in Drive 3 to keep from torque converter kicking in during city driving, but now i don't need to. The torque increase makes the response right there and ready. I also notice a big improvement midrange on the highway.

Good luck in whatever you do. I really did change my mind at "the very last minute" and I am glad I did.

 

How are you getting a single 3" in, when the truck has dual cats? You have a pipe that merges them into one, into a single muffler, then back out to duals?


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keith@myf150.com
http://www.myf150.com
Rocky Mount, NC

1999 F-150 XLT Styleside, Black On Black, SuperCab, Short Bed, 4x4, ORP, 4.6L Auto, 3.55LS

Mods: DrawTite Class III Hitch, Smittybilt Outland Grill Guard/Brush Guards, KC Daylighters, Custom Dual Exhaust-Straight Out The Back, Airaid FIPK, SuperChips Chip, Bug Deflector, Pace-Edwards Roll-Top Bed Cover

 

conqsoft: Why are you replacing the glasspacks? I had a 1992 F-150 before I bought my '99 and had true duals installed (w/o H-pipe) with dual converters and glasspacks and loved the sound. I had a noticeable increase in power and MPG also. When I grew up all pickups had glasspacks (or so I thought). Are the Flowmasters you are getting the 2-chamber or 3-chamber?

 

I'm replacing them to get some torque back. I like the sound, but I want my power back. They are 2 chamber flowmasters.


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keith@myf150.com
http://www.myf150.com
Rocky Mount, NC

1999 F-150 XLT Styleside, Black On Black, SuperCab, Short Bed, 4x4, ORP, 4.6L Auto, 3.55LS

Mods: DrawTite Class III Hitch, Smittybilt Outland Grill Guard/Brush Guards, KC Daylighters, Custom Dual Exhaust w/ Dual Flowmaster 40's-Straight Out The Back, Airaid FIPK, SuperChips Chip, Bug Deflector, Pace-Edwards Roll-Top Bed Cover

 

My Magnaflow is a two chamber. I like it. I like it alot!