Triumph Tiger 800 - Tuning - Air-box
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In my opinion the standard air filter should flow enough air to keep up with the
flow through the throttle bodies so I am not planning to upgrade the air filter
anytime soon.
This is the view of the standard Air Intake on my 2015 Tiger 800,
circled in blue is the location of the one and only mounting
screw.  The Air Intake is easy to remove and a bit fiddly to replace.
View with the Air Intake removed, circled in Red is the large
diameter intake pipe, circled in yellow is part of a thin rubber
skirt that stretches across the top of the frame possibly to direct
air, keep water out or to maybe to keep noise in.
Photo of the Air Intake from an early Tiger 800, note the
narrow moulding and the small cross section
Photo of the Air Intake from my Tiger 800 XCx 2015.  No I have
not been cutting away the moulding, this is stock Triumph,
clearly  effort has been made in improve air flow into the
Air-box.  The inside diameter of the air intake is 47mm which is
larger than the single intake on my stock Tiger 1050.  However
the 800 intake faces rearward, on the 1050 the intake faced
As I write this in October 2015 no one seems to have attempted an Air-box mod on a Tiger 800 2015.   It was easy to tweak my
Tiger 955i and Tiger 1050 with Air-box mods to gain modest but tangible improvements in performance. ( I did not make
changes to my Explorer, it  had more than enough power as standard).  I do not want to spoil the road manners of the standard
800 motor.  On investigation It seems that Triumph have got there before me because the air intake on the 2015 model is less
restrictive.  Like all manufacturers Triumph are forced to restrict airflow into the Air-box in order to eliminate induction noise.  So I
am thinking will my Tiger 800 run better with the Air Intake moulding removed?  Also see Tuning Summary page.
Air-box - My Conclusion
When I put my Tiger 800 XCx on the Dyno we proved that the Arrow Tune +
the Leo Vince Evo2 silencer improved power delivery, especially at the
bottom end.  On my final run removing the plastic Air Intake improved low
end power slightly and gave the best fuelling.

I therefore decided to make a number of runs on the road with and without
the Air Intake in place and measure the results using the Torque App on
my Galaxy Note 4 phone.  I repeatedly tried Top Gear Roll-Ons from 2,500
revs to measure 40-60, 60-80 and 80-100 times.  Without the air intake
there was more induction noise, this additional noise was obvious in the
Dyno room but less so on the road.

On the road the best results occurred when the Air Intake was in
.  This surprised me, there is little difference but the initial pickup 3 -
4,000 revs and 4 - 5000 revs was better with the plastic Air Intake in
place.   I assume that Triumph have spent a lot of time in a wind tunnel
and the Air Intake is designed to trap and redirect air as it flows through
the Tiger's bodywork.  I thought removing the Intake would help, it does in
static air on the Dyno but not when riding on the road.  Overall this is not a
bad thing because I can leave it in place and I do not have to tell my
insurance company or risk invalidating my warranty.
In my youth I spent many hours gas flowing all sorts of engines.  The Air
Intake moulding has many rough edges and the area below the intake
hole is particularly bad so I spent time smoothing these out with a rotary
file to improve air flow.  
Shame really, I was hoping that removing the Air Intake would result in a
marked improvement. I am sure that fitting a larger, shorter bellmouth
close to the Air-box would really help top end but I am not going to bother,
too much hassle to get it set up correctly.  If I want to go really fast I can
ride my MV.