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post #1 of 12 (permalink) Old 04-13-2019, 12:03 PM Thread Starter
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EXHAUST , True Duals or?

Im curious , 2x2 or 2x1 , my bike is pretty much stock and i dont plan to do anything other than a few upgrades and all a little at a time .

I realize the 2x1 get more power , but that might be negligible , i can still ride long distance , pass vehicles etc,. I dont have the bucks for stage series of upgrades so im just going a lil at a time , this is my forever bike now .

Anyway can you wrenches tell me the good stuff and bad of each


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post #2 of 12 (permalink) Old 04-15-2019, 02:58 PM
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2-1 Or 2-2

Most riders agree that putting true duals on a bike will kill the low end torque...At least it did on mine. After a bit I changed over to V & H power duals and the bike ran great and a lot cooler with those pipes and mufflers plus it had a lot of grunt on the low end. Also, 2-2 pipes will make the bike run hotter than usual. The pipes need to be joined at some point to help ease exhaust gas scavenging and with true duals that doesn't happen. It is harder for each cylinder to push the exhaust gas out by itself than with help from the other cylinder.
You don't mention what year your bike is or which motor it has.
If you want a 2-1 pipe, I personally would recommend a RB racing pipe. They make great power and the quality of workmanship is unsurpassed. I have one on my 06 Dyna and I love it. You have to call them and order it and then wait. They are made one at a time as they are ordered.They won't charge your credit card until they ship it from California. Sometimes the wait can be rather long but to me it was worth it. If you are a veteran the owner will give you a 10% discount.
On my 2017 Roady, I still have the stock head pipes with RC Exhaust mufflers and I'm very pleased with both the sound and performance. They get louder with age but no so loud as to be obnoxious or drone on long interstate trips.
It's your choice as to what you put on your bike but I personally would stay away from true duals.
The power that is gained from the pipes are not dyno only numbers, as you can really feel them on your seat dyno as well.


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post #3 of 12 (permalink) Old 04-15-2019, 06:20 PM
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I have the V&H true duals (no cat), along with S&S Grand National mufflers and the H-D torque cam.

I am also aware of the warnings about losing low-end torque, but i am all about the aesthetics and I just don't like that lump of metal where any of the 2-1-2 pipes meet.

I find have more power and torque than I have ever known. Much of that may be due to the cam. The exhaust ain't hurting my feelings though.

But then, I am new to this bike, and coming straight off a 1980 FXWG ;-)
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post #4 of 12 (permalink) Old 04-15-2019, 07:55 PM
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Couldn't have said it better than the two above. Are you an aesthetics guy or a gear head ? I do believe you'll have more than enough power with the duels on the M8 ,but you will notice the difference.

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post #5 of 12 (permalink) Old 04-15-2019, 08:47 PM
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You can enjoy the benefits of a 2-1 and a 2-2 exhaust with a 2-1-2 headpipe and losing the cat. 2 of my favorites are the Fullsac MX and the Fuel Moto headers.
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post #6 of 12 (permalink) Old 04-15-2019, 09:20 PM
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+1 on the 2-1-2.

Its the best all around pipe, and some of them will even hide behind the oem shields.


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post #7 of 12 (permalink) Old 04-15-2019, 09:42 PM
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I've got a Cobra 2-1-2 "H" pipe. It looks like duals, you can't see the crossover. It's been installed since 2015 and has held up well.

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post #8 of 12 (permalink) Old 04-16-2019, 04:42 AM
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For me, I purchased a oem header with the cat removed from the auction site. I get a bit more sound from the exhaust and have reduced heat.

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post #9 of 12 (permalink) Old 04-17-2019, 01:36 PM
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What about 2-1-2, got fuel moto jackpot headers going on mine.
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post #10 of 12 (permalink) Old 04-17-2019, 01:44 PM
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Quote:
Originally Posted by Heavy Metal View Post
What about 2-1-2, got fuel moto jackpot headers going on mine.
Good choice. To maintain the stock appearance and keep some of the low end torque, just about any 2-1-2 header is going to perform better on the low end than true duals (assuming no other engine work).

A good 2-1 setup will usually give the best pull bottom to top and there's a reason that many tuners would prefer to tune a 2-1...........

I personally wouldn't put true duals on a touring bike unless there was other motor work that would give you a reason to really need duals.


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