Ehaust crossover question
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6th Gear
Joined: Oct 2007
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Ehaust crossover question
I just purchased a 2005 FLTRI and noticed that it is not a true dual exhaust system.I am new toHarley's and am curious why this would be done. I fired the bike up and checked the pressure output of each pipe. The right side was putting out more pressure and conversley more volume than the left. Is there a reason for this? I noticed some aftermarket systems advertised as true duals.Would I gain more by simply eplacing the slipons with and aftermarket set or do I need to go to the true duals.
Ofscout
Ofscout
Road Master
Joined: Oct 2006
Posts: 768
Likes: 8
From: NE Ohio
RE: Ehaust crossover question
This is done because of E P A !!! For your bike to run better and breathe easier, Stage 1 a/c and map, true dual system. A step further to tweak the system, add SERT, PC III or tuner of your choice and Dyno it. Note: there is a CO$T factor here !!
Road Warrior
Joined: Jul 2006
Posts: 1,532
Likes: 7
From: Rochester N.Y.
RE: Ehaust crossover question
Scout , this is purely my opinion , but.......
The stock exhaust is designed for flow in the RPM range we (baggers) use , 1/4 to 3/4 throttle.
If you look at the right side of the bike , you have a 2 into 1 design system.
If you look at the rear , it looks like a dual exhaust setup.
Most people who buy baggers like the balanced look of a dual exhaust.
Most would agree that a 2 into 1 system makes better power , but looks funny on a touring bike.
I think HD tried to give us the best combination of looks and performance for heavy touring bikes.
A true dual system moves the power curve up slightly and drops some torque off the bottom.
The true dual setup doesn't "help" the engine scavenge like a 2 into 1 system would.
Instead true duals offer a complete pipe per cylinder , and cool sound that guys usually like.
True duals have a sound like 2 750cc single cylinder bikes running in sync.
True duals will increase the sound level over the stock setup , cool but louder.
I ran true duals for a while , and the sound was very cool , but got irritating after a couple hundred miles cruising.
I had the duals ,then stock , then duals , and now stock , just to make sure I was hearing the difference properly.
The stock setup tames the exhaust note by blending the cylinders together for a more smooth , easier to control sound output.
The stock setup gives us the best combination of performance/looks that they can.
The factory has to comply with federal standards for sound output , and the stock setup works well.
For real performance , the 2 into 1 system must have equal length pipes and a proper collector to scavenge correctly.
The 2 into 1 system sounds a little more "Nascar" ish than true duals , but to each his own.
Hope this wasn't confusing.
Mick
The stock exhaust is designed for flow in the RPM range we (baggers) use , 1/4 to 3/4 throttle.
If you look at the right side of the bike , you have a 2 into 1 design system.
If you look at the rear , it looks like a dual exhaust setup.
Most people who buy baggers like the balanced look of a dual exhaust.
Most would agree that a 2 into 1 system makes better power , but looks funny on a touring bike.
I think HD tried to give us the best combination of looks and performance for heavy touring bikes.
A true dual system moves the power curve up slightly and drops some torque off the bottom.
The true dual setup doesn't "help" the engine scavenge like a 2 into 1 system would.
Instead true duals offer a complete pipe per cylinder , and cool sound that guys usually like.
True duals have a sound like 2 750cc single cylinder bikes running in sync.
True duals will increase the sound level over the stock setup , cool but louder.
I ran true duals for a while , and the sound was very cool , but got irritating after a couple hundred miles cruising.
I had the duals ,then stock , then duals , and now stock , just to make sure I was hearing the difference properly.
The stock setup tames the exhaust note by blending the cylinders together for a more smooth , easier to control sound output.
The stock setup gives us the best combination of performance/looks that they can.
The factory has to comply with federal standards for sound output , and the stock setup works well.
For real performance , the 2 into 1 system must have equal length pipes and a proper collector to scavenge correctly.
The 2 into 1 system sounds a little more "Nascar" ish than true duals , but to each his own.
Hope this wasn't confusing.
Mick
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6th Gear
Joined: Oct 2007
Posts: 13
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From:
RE: Ehaust crossover question
Thanks for the info. I will probably go with a new set of slipons first with a K&N a/c and a remap. I was planning to pickup a Power Commander unit as that is what our local bike shop(not Harley Dealer) recommends.
ofscout
ofscout
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