True duals = less torque?
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Road Warrior
Joined: Jun 2011
Posts: 1,391
Likes: 351
From: MO
True duals = less torque?
I want to get rid of the catted head pipes on my 2011 Street Glide. I've been reading that some true duals lose torque over the factory headers. Are there any brands of true dual headers (I want to keep my SE mufflers) that do not compromise torque?
TDs don't always lose torque to the stock system. My experience with Rinehart TDs is that they will make gains across the entire rpm range, compared to the stock headers. I've installed Samson TDs, and the fullsac TD conversion that lost a little off the bottom, but it was a very little, and mostly not noticible once the bike was tuned. I've had nothing but great luck with Rineharts, which is why I run them on my own bike.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
My firsthand experience of using TDs is this. With my S&S 107" I got 102HP/103TQ. Changing to a 2-into-1 my numbers changed to 101HP/107TQ. However that is only part of the picture! I gained around 15TQ in the mid-range, so the torque curve is now very flat, but with the TDs there was a slight lift mid-range to the higher numbers. I was very happy with the TDs, but I am even happier with my latest system. The bike is smoother running and pulls easily from remarkably low rpms.
Stellar HDF Member
Joined: Oct 2010
Posts: 2,589
Likes: 98
From: Port Orange, Fl
It's not that you lose the top #'s, it's the fact you lose several ft lbs in the useable range. Pulling away from a stop is where you notice it or a lower rpm roll on the throttle.
I liked the sound of TD's over loss of TQ.
I liked the sound of TD's over loss of TQ.
HDF Community Team
Joined: Jun 2006
Posts: 12,774
Likes: 2,606
From: san antonio
The question is too general. IMHO, true duals work better on larger displacement motors that are pushing more exhaust. Additionally, when you say "true duals" you include all true dual systems and, IMHO again, some are better than others.
The question of whether or not true duals will result in the loss of torque should be couched in the context of the application. A more appropriate question would be, "will true duals result in a loss of torque on my stock/Stage I/Stage II/StageIII/120r/103" motor". Just saying that the answer may very well be different depending on the application.
The question of whether or not true duals will result in the loss of torque should be couched in the context of the application. A more appropriate question would be, "will true duals result in a loss of torque on my stock/Stage I/Stage II/StageIII/120r/103" motor". Just saying that the answer may very well be different depending on the application.
Road Warrior
Joined: Mar 2007
Posts: 1,396
Likes: 146
From:
True duals sound good and solve heat on the rider and passenger problems. You probably won't feel much, if any difference, over the stock system with the cats. It would probably make the bike a lot nicer to ride.
If you are a big guy, and pack double a lot, and feel you can't afford to lose any low end grunt, bite the bullet and get a 2 into 1. That change will give you plenty of torque right where a bagger needs it. Guys who run 2 into 1's rarely run duals again.
If you are a big guy, and pack double a lot, and feel you can't afford to lose any low end grunt, bite the bullet and get a 2 into 1. That change will give you plenty of torque right where a bagger needs it. Guys who run 2 into 1's rarely run duals again.
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Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
True duals sound good and solve heat on the rider and passenger problems. You probably won't feel much, if any difference, over the stock system with the cats. It would probably make the bike a lot nicer to ride.
If you are a big guy, and pack double a lot, and feel you can't afford to lose any low end grunt, bite the bullet and get a 2 into 1. That change will give you plenty of torque right where a bagger needs it. Guys who run 2 into 1's rarely run duals again.
If you are a big guy, and pack double a lot, and feel you can't afford to lose any low end grunt, bite the bullet and get a 2 into 1. That change will give you plenty of torque right where a bagger needs it. Guys who run 2 into 1's rarely run duals again.
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Road Captain
Joined: Aug 2009
Posts: 619
Likes: 3
From: In Garage
True duals do sound good. And look good. But I will never switch out my thunderheader for them.
I heard if your not twisting over 4000 all the time they are not for you. But who cares, bottom line is if they look good to you and sound good you chances are your not going to worry about a few horses.
I heard if your not twisting over 4000 all the time they are not for you. But who cares, bottom line is if they look good to you and sound good you chances are your not going to worry about a few horses.