True Duals?

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Mar 7, 2019 | 05:46 PM

#11

langwilliams

Elite HDF Member

Joined: Jul 2010

Posts: 3,830

Likes: 302

From: Lorain Ohio

I was reading up on Rush exhaust an their website says their performance duals with a balance chamber make 5 hp an 5 tq over their straight duals. one big difference might be where it makes power an how long it carries that power through the band. Not everyone is trying to squeeze every drop of performance out of their bike.

Mar 7, 2019 | 06:52 PM

#12

nutsandbolts5212

Road Warrior

Joined: Sep 2009

Posts: 1,426

Likes: 821

From: Shitcago, Illinois

Yes you should retune the motor, the ECM may adjust, however, it might be too much of an adjustment. I have a thread on this very topic, check it out:

https://www.hdforums.com/forum/touri...motor-2-a.html

Ride safe!

Mar 7, 2019 | 07:14 PM

#13

1957buick

Road Master

Joined: Jul 2010

Posts: 976

Likes: 212

From: northern nj

Put on a high flow A/C then get it tuned

Mar 7, 2019 | 07:15 PM

#14

EdwardK

Road Warrior

Joined: Nov 2007

Posts: 1,800

Likes: 307

From: Houston, Texas

How's it run? Any decel popping or backfiring? As another had mentioned, unless you changed the intake, it's the same amount of air going in. If the bike is running good, then it should be fine as is. A tune might get it a little better but probably not enough to notice. Your call and your money. I personally follow the rule, if it ain't broke, don't fix it.

Mar 7, 2019 | 07:24 PM

#15

Scout

Seasoned HDF Member

Joined: Sep 2004

Posts: 6,197

Likes: 708

From: (Toronto) Canada

Quote:

Originally Posted by cajun1957a

Scout, telling him that was being bit of a dick don't you think?

Yes, I know I can be (am) a jerk. But before the op spends one more Penny someone should tell him to put the old parts back on if performance is the objective.

Mar 7, 2019 | 07:27 PM

#16

Scout

Seasoned HDF Member

Joined: Sep 2004

Posts: 6,197

Likes: 708

From: (Toronto) Canada

Quote:

Originally Posted by Sandman1234

Scout, thanks for the reply. I did notice a slight reduction in performance. Went to true duals because the rear exhaust cracked right at the cylinder. I'll get it retuned.

I apologize. True duals sound great. If you want power back, get the tune.

Mar 8, 2019 | 04:11 AM

#17

grbrown

Club Member

Joined: Jun 2007

Posts: 45,429

Likes: 2,898

From: Bedford UK

Quote:

Originally Posted by langwilliams

BSA discovered that providing a balance pipe improved performance on their parallel twins, back in the 1960s. Prior to that most twins had separate pipes and mufflers, a notable exception being some V-twins which used a 2-into-1! Within a short time most brands of twin-cylinder engined bikes was adding one, as they do to this day. Some aftermarket brands add a hidden balance pipe to their duals, to gain the benefit. It's a long standing practice!

Mar 8, 2019 | 06:10 AM

#18

roussfam

Seasoned HDF Member

Joined: Jan 2009

Posts: 12,686

Likes: 8,291

From: Ottawa, Ontario

Cobra True Duals and 2010 and up stock mufflers on my 07. Great mellow sound, and happy with the performance. I'm guessing the stock mufflers add a bit of back pressure. Nice sound at idle with the SE204 cams

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Mar 8, 2019 | 03:30 PM

#19

lp77

Cruiser

Joined: Apr 2011

Posts: 213

Likes: 12

From: Netherlands

You definately have to retune. I did the same last summer. Changed to the V&H dresser duals and it’s running way to lean and way to hot.

Mar 8, 2019 | 07:14 PM

#20

Grady10

Cruiser

Joined: Apr 2010

Posts: 204

Likes: 27

From: Huntsville, AL

Your gonna really like that exhaust. I have the same on mine with the 909 Twins mufflers. Get a tuner and hi-flo breather and spend the money on a dyno. Mine is a stock 96 and I am getting 73 hp and 89 tq and getting 42-45mpg.