Pros and Cons of "True Duals"
Thread Starter
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Outstanding HDF Member
Joined: Jul 2007
Posts: 3,341
Likes: 9
From: Woodinville, WA
Want the cat removed...go to www.fullsac.com and read what they have to say. Call Steve and talk to him--very heplfull and knowledgeable. He can remove the cat and send your pipe back to you in a few days. Stock look and no cat!!
Road Master
Joined: Apr 2008
Posts: 1,230
Likes: 1
From: Oak Park, IL
On the dyno I lost 4 ft lbs of torque when I went to true duals on the '08, I can't tell when riding it. However, not once this summer did it get too hot to ride, it made a huge difference! Last year I had to shut the motor off a couple of time.
Outstanding HDF Member
Joined: Jul 2007
Posts: 3,410
Likes: 8
From: Knoxville, TN
I look at the 2:1 systems differently.
Yes, I run them.
Reason?
I asked myself a question when I was building my SG motor.
"Why am I building a motor for power when I reduce the power using a true dual?"
I couldn't find a reasonable answer so I went with the Bassani Road Rage 2:1 system.
I know the true duals look better, more balanced...but if you are now, or will ever, "hot rod" your motor...I say save the money and buy a pipe once, go with the 2:1 system.
Yes, I run them.
Reason?
I asked myself a question when I was building my SG motor.
"Why am I building a motor for power when I reduce the power using a true dual?"
I couldn't find a reasonable answer so I went with the Bassani Road Rage 2:1 system.
I know the true duals look better, more balanced...but if you are now, or will ever, "hot rod" your motor...I say save the money and buy a pipe once, go with the 2:1 system.
Road Warrior
Joined: Jan 2008
Posts: 1,752
Likes: 0
From: Indianapolis, IN
Your bike will be louder especially since you are changing the cams too. When I went from my stock headers with Samson slipons to V&H dresser duals and added the cams, my bike became too loud. It was much louder. It was so loud I had to change out the slipons. Some say the Monster Ovals are not loud enough, but with dual headers and cams, they sound great! Plus with a little more back pressure from the MOs gives back some torque.
Last edited by Ozoneman; Oct 30, 2009 at 09:51 PM.
Elite HDF Member
Joined: Jul 2007
Posts: 4,749
Likes: 16
From: sand mountain Alabama
With true duals and a cam change expect a lot more noise.
I wasn't expecting that much of a volume increase, but I got it.
V&H true dual headers
SE 64895-07a slip on's
SE 255 cams
I will be changing my slip on's this winter to lower the volume some.
Oh, I have plenty of low end power now. Got any stumps needing pulled.
dd
In God we Trust
I wasn't expecting that much of a volume increase, but I got it.
V&H true dual headers
SE 64895-07a slip on's
SE 255 cams
I will be changing my slip on's this winter to lower the volume some.
Oh, I have plenty of low end power now. Got any stumps needing pulled.
dd
In God we Trust
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
I reckon the true duals v 2 into 1 difference is an internet myth. It is quite likely that if we take the same bike and dyno it to dial it in to each system there will be a difference between the two setups, but I doubt if it will be enough to argue over.
I have an S&S 107 and before installing it asked S&S what systems they recommended for it and true duals was one of their options. On the dyno I get slightly better figures than they give in their catalogue and a similar shape torque curve. I am very happy!
Go with which ever system you fancy most. True duals will be great. Just don't expect it to behave as popular myth says it will!
I have an S&S 107 and before installing it asked S&S what systems they recommended for it and true duals was one of their options. On the dyno I get slightly better figures than they give in their catalogue and a similar shape torque curve. I am very happy!
Go with which ever system you fancy most. True duals will be great. Just don't expect it to behave as popular myth says it will!
Last edited by grbrown; Oct 31, 2009 at 10:46 AM. Reason: Grammar
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Supporter
Joined: Jul 2007
Posts: 2,196
Likes: 10
From: Shenandoah, TX
Like other have already said, the difference is little. I had true duals before and after my build. After the dyno with TD, my no's. were 92hp and 108tq. After I put on the 2 to 1 TH I gained 2 hp and 2 lb's tq and a lot of noise.The TD I had were V&H with Wild Piggs, and the sound was kinds tinnie, but load. The TH are just load, but in a deeper way. I will have to admit the heat was not as bad with the TD as it is with TH.
