2 into 2 vs 2 into 1
#2
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#6
Join Date: Jan 2015
Location: Sandy Eggo's North County
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More noise? Probably a 2 into 2.
More torque? Definitely a 2 into 1.
If you want lotsa noise and no power, then 2 into 2 can't be beat!
Or, as the sportbikers say, "All sound and no ground!"
EDIT~ Oh yeah, welcome to the site!
Last edited by NORTY FLATZ; 04-02-2017 at 10:21 PM. Reason: dunno
#7
The best for you depends on your preferences.
If you like the look of a 2:2, go for it. I like them.
They don't have to be loud and you can get acceptable performance from them with proper set-up. A cross-over pipe helps greatly with mid and low-range torque.
If you like the look and sound of a 2:1, you also have many choices. For horsepower junkies, the 2:1 is generally considered better in that regard but maybe that should not be the number 1 consideration for you.
I recently went to the V&H Upsweep on my Dyna and I am very happy. It's shorter and light weight. Performance is great (requires re-mapping).
I'm running a V&H FP3 with a K&N filter in an open-back housing.
Whatever you buy, if sound/tone is a big consideration, be aware that the longer exhaust systems tend to deliver a deeper tone than the shorter systems like the Upsweep. It is just like musical instruments. The longer horns tend to produce the lower notes.
Also, be aware of ground clearance issues. Some systems may hang low or too far to the outside and scrape when you make turns. It all depends on the system and the ride height of your machine.
One other consideration is the positioning of your O2 sensors. Many manufacturers use the older larger 18MM bungs and provide a bushing to adapt to the newer 12MM O2 sensors. Unless their welded-on bungs are recessed into the pipes, if you use the 12MM O2 sensors, they may not reach far enough into the exhaust gases to get a good reading.
If you like the look of a 2:2, go for it. I like them.
They don't have to be loud and you can get acceptable performance from them with proper set-up. A cross-over pipe helps greatly with mid and low-range torque.
If you like the look and sound of a 2:1, you also have many choices. For horsepower junkies, the 2:1 is generally considered better in that regard but maybe that should not be the number 1 consideration for you.
I recently went to the V&H Upsweep on my Dyna and I am very happy. It's shorter and light weight. Performance is great (requires re-mapping).
I'm running a V&H FP3 with a K&N filter in an open-back housing.
Whatever you buy, if sound/tone is a big consideration, be aware that the longer exhaust systems tend to deliver a deeper tone than the shorter systems like the Upsweep. It is just like musical instruments. The longer horns tend to produce the lower notes.
Also, be aware of ground clearance issues. Some systems may hang low or too far to the outside and scrape when you make turns. It all depends on the system and the ride height of your machine.
One other consideration is the positioning of your O2 sensors. Many manufacturers use the older larger 18MM bungs and provide a bushing to adapt to the newer 12MM O2 sensors. Unless their welded-on bungs are recessed into the pipes, if you use the 12MM O2 sensors, they may not reach far enough into the exhaust gases to get a good reading.
Last edited by leafman60; 04-03-2017 at 12:30 PM.
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#8
As you can see by the accompanying dyno sheet, this 103 struggles to get over 100 ft lbs of torque at 2200 rpm...no telling what a monster it could have been with a 2-1
Sarcasm; yes...I've not seen dyno sheets as dramatic as the claims of many 2-1 proponents. Marginal differences at best; more dependant on tuning. I had a V&H 2-1 big radiius on my current bike and it was crap on the dyno; currently running a 2-1 RB Black Hole with an added vortex cone on an FXDF for quieter running. When most refer to improvements over a 2-2, they're often comparing to drag pipes...the worst pipes ever for bottom end (and racket)
Sarcasm; yes...I've not seen dyno sheets as dramatic as the claims of many 2-1 proponents. Marginal differences at best; more dependant on tuning. I had a V&H 2-1 big radiius on my current bike and it was crap on the dyno; currently running a 2-1 RB Black Hole with an added vortex cone on an FXDF for quieter running. When most refer to improvements over a 2-2, they're often comparing to drag pipes...the worst pipes ever for bottom end (and racket)
#9
I went from a stock header (cross over pipe) with slips to a 2 into 2 and I didnt lose any low end torque. Its got good power across the entire rpm range. I expected to but it never happened. Just in case someone wonders, I'm running a VH Big radius map getting 40s for mileage. Im pretty happy with that.
#10