which Air Filter?
Reasons...low profile for plenty of leg clearance, I like the mechanical look of seeing into the throttle body, like that I was able to color match the back plate, it provides only clean cool air into the engine so that it runs best.
Most A/C systems vent the hot dirty oily crankcase air back into the air cleaner, thru the throttle body and into the combustion chamber. Result is compromised performance, gummy build-up in the throttle body and carbon build-up on the pistons which just cause problems down the road.
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Road Warrior
Joined: Jun 2010
Posts: 1,337
Likes: 4
From: Sunny South Florida
Now if you add cams, then absolutely. But to say you "Need" a tuner with an AC, a bit of a stretch.
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
Over the yrs of researching and learing, Here are some numbers I've found and keep..
Info the CFM's of different Air filter and how much there Air Flow is
HD stock - 171CFM
Stage 1 Big Sucker - 200CFM
Stage 2 Big Sucker - 250CFM
Kuryakyn Twin Velocity - 270CFM
E-3014 = 248 CFM RK-3009 kit
E-3037 = 301 CFM RK-3910 kit
HD-0800 = 231 CFM SE replacement
Doherty Powerpacc - 287CFM
SE Air Cleaner - 287 CFM
Zippers - 321 CFM
Woods Carbs - 4 models 235CFM upto 340CFM
BC Overflow - 800+CFM
Your actual need is (103 X 5800 X .9 divided by 3456 = about 155 CFM) is what your engine will flow and need..
So if you keep you filter clean,,, anything over 250 CFM will/ should be plenty on stock heads and cams 103..
I went with SE/AC and it works well with my cams and no head work, i did buy a Real K&N filter for it,, Not the HD filter made by K&N,, they are not the same
Thinking just get the one that rings your bell and then make sure it has enough flow..
Info the CFM's of different Air filter and how much there Air Flow is
HD stock - 171CFM
Stage 1 Big Sucker - 200CFM
Stage 2 Big Sucker - 250CFM
Kuryakyn Twin Velocity - 270CFM
E-3014 = 248 CFM RK-3009 kit
E-3037 = 301 CFM RK-3910 kit
HD-0800 = 231 CFM SE replacement
Doherty Powerpacc - 287CFM
SE Air Cleaner - 287 CFM
Zippers - 321 CFM
Woods Carbs - 4 models 235CFM upto 340CFM
BC Overflow - 800+CFM
Your actual need is (103 X 5800 X .9 divided by 3456 = about 155 CFM) is what your engine will flow and need..
So if you keep you filter clean,,, anything over 250 CFM will/ should be plenty on stock heads and cams 103..
I went with SE/AC and it works well with my cams and no head work, i did buy a Real K&N filter for it,, Not the HD filter made by K&N,, they are not the same
Thinking just get the one that rings your bell and then make sure it has enough flow..
Road Captain
Joined: May 2014
Posts: 648
Likes: 35
From: San Diego
So yes you are right, you dont "need" a tune for anything because your bike will still run. However, you might want a tuner to gain any performance advantage out of it.
Road Warrior
Joined: Jul 2014
Posts: 1,584
Likes: 520
From: VA
Over the yrs of researching and learing, Here are some numbers I've found and keep..
Info the CFM's of different Air filter and how much there Air Flow is
HD stock - 171CFM
Stage 1 Big Sucker - 200CFM
Stage 2 Big Sucker - 250CFM
Kuryakyn Twin Velocity - 270CFM
E-3014 = 248 CFM RK-3009 kit
E-3037 = 301 CFM RK-3910 kit
HD-0800 = 231 CFM SE replacement
Doherty Powerpacc - 287CFM
SE Air Cleaner - 287 CFM
Zippers - 321 CFM
Woods Carbs - 4 models 235CFM upto 340CFM
BC Overflow - 800+CFM
Your actual need is (103 X 5800 X .9 divided by 3456 = about 155 CFM) is what your engine will flow and need..
Info the CFM's of different Air filter and how much there Air Flow is
HD stock - 171CFM
Stage 1 Big Sucker - 200CFM
Stage 2 Big Sucker - 250CFM
Kuryakyn Twin Velocity - 270CFM
E-3014 = 248 CFM RK-3009 kit
E-3037 = 301 CFM RK-3910 kit
HD-0800 = 231 CFM SE replacement
Doherty Powerpacc - 287CFM
SE Air Cleaner - 287 CFM
Zippers - 321 CFM
Woods Carbs - 4 models 235CFM upto 340CFM
BC Overflow - 800+CFM
Your actual need is (103 X 5800 X .9 divided by 3456 = about 155 CFM) is what your engine will flow and need..
Road Master
Joined: Oct 2009
Posts: 797
Likes: 166
From: MA
FWIW, I just had this done by an indy mechanic (along with new slip ons and fuel pak)...he used a V&H naked VO2, with original cover.
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Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
The engine computer will see a different air filter as a change in air density or manifold air pressure, and adjust for it the same way it does for an altitude change, which it does just fine.
