2 into 1 vs. 2 into 2 pipes - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 9 (permalink) Old 09-07-2009, 11:25 PM Thread Starter
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2 into 1 vs. 2 into 2 pipes

2 into 1 vs. 2 into 2 pipes

what is the diff and withch is better and why
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post #2 of 9 (permalink) Old 09-08-2009, 10:34 AM
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YouTube - Exhaust Systems and Performance: 2-into-1 vs. 2-into-2

Watch this. Done.

2:1 = low and mid RPM range power increases
2:2 = high RPM range power increases

You will appreciate the power increase most from a 2:1 but a 2:2 looks better in most opinions and you can get 2:2s with a "Power Chamber" or "Cross Over" which connects to the two pipes together in line at some point (like an X-Pipe on a Mustang).
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post #3 of 9 (permalink) Old 09-08-2009, 01:08 PM
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^^^ will agree. 2-1 produces more HP and torque nunbers in the midranges, (Where most owners ride at...) then 2-2 set ups.....

Dyno numbers prove it.

When the going gets weird, the weird turn professional.... ~ Hunter S. Thompson~

R.I.P. Rubberdown. 1971-2012
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post #4 of 9 (permalink) Old 09-08-2009, 05:50 PM
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Originally Posted by sirbOOm View Post
You will appreciate the power increase most from a 2:1
Isn't the Fatbob's 2:1 Tommy Guns actually a 2:1:2?

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post #5 of 9 (permalink) Old 09-10-2009, 02:44 PM
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I run drag pipes and wouldn't have it any other way. Can't beat the obnoxiously loud "wake the neighbors" sound at 6:30 in the morning...

I do sacrifice power, but worth it, even on the highway....
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post #6 of 9 (permalink) Old 09-12-2009, 01:57 PM
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Yes my fat bob is 2-n-1-n-2. But I'm still waiting for the mailman to bring me my Big Radius 2-n-1 Chrome Vance and Hines. Who's gonna burst my bubble and tell me I have to buy something else like a commander for the CVO? I swear Narley engineers are aliens.

Last edited by Lucky Chucky; 09-12-2009 at 01:58 PM. Reason: forgot question mark
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post #7 of 9 (permalink) Old 09-14-2009, 07:03 PM
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My black Thunderheader with heat wrap ROCKS!
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post #8 of 9 (permalink) Old 09-21-2009, 03:42 PM
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V and H told me there is a remarkable difference in noise levels between the 2 in 1 and the 2 in 2. 2 in 2 are supposed to be ALOT louder, i'm considering the 2 in 1 if I get the new Fat bob.
My buddy has the Long shots and they're painfully obnoxious at higher rpms when he leaves in a hurry.

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post #9 of 9 (permalink) Old 09-23-2009, 01:22 PM
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i have heard nothing but great things about thunderheaders. I wish i could afford one right now but for the time being im sticking with the $50 dollar drag pipes.

"Don't hit at all if it is honorably possible to avoid hitting; but never hit soft."
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"Treat me good, I'll treat you better. Treat me bad, I'll treat you worse"
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