I was out riding yesterday and pulled up at a pub for a break. While there, I noticed the inside of my pipes had a light tan colour to them. I’ve never really noticed this on vehicles before. They’re usually a sooty black, yes? What does tan mean? Is it running lean? It was Dyno tuned only a month ago. 

98, 95 or 91 unleaded?

The 98 fuels have more 'cleaners' in them which could contribute to the pipe color and you mentioned a recent tune? .
Could just be that the bike is running at optimum burn with correct VE values from the dyno rather than unburnt fuel / too rich which is not good for the bores and oil.
A check of the plugs can set your mind at ease, light gray to tan in color
Is the bike behaving normally & well?
Did you notice it after a long ride and constant throttle, eg Highway?
Unleaded fuels can show a light color in the exhaust pipe after long highway runs at cruise and then darken up (sooty)  in stop / go driving / riding
 

If the SE intake was put on after the dyno tune, Id advise that you get it checked as in re-tuned to allow for the extra air being drawn into the motor as the VE values will most likely be out. 
the ECM can only compensate so much for changes like that

Nah, I bolted on the SE and then had it tuned :-)

heard 95 is the best fuel to use ..  when I run 98 the bike pings.. try a few tanks of 95 see what happens

I use 95
I can get 95 most places and my bike is tuned with TTS on 95
If I can't get 95, the other options are a minor shift up or down.
Don't agree with running 98. a slower burn, rarely a complete burn with the engines that we have.
All that happens is the heads and pistons carbon up.
My plugs and pipes are telling me the combustion is right where it should be.
The same with my carbed bike.
If the 98 is not turned over often enough, all the goodies are lost from the fuel anyway.

I have a friend that owns/runs his own workshop building and tuning anything that comes in the door, very knowledgeable bloke.

older bikes & cars, eg non efi without all the smarts to ensure optimum mixture's based on sensor burn data when running 98 type fuels can run excessively rich. it  washes bores, contaminates the oil, etc.

   

There was a fuel discussion some weeks ago (with some interesting insights), haven't quite mastered the navigation of this site...suffice to say
I've been running Caltex 98, every time I use BP98 I get the same issue, I thought it was their BS advertising re two tanks and clean???

Would be nice to hear some sound mechanic's thoughts!

My Apologies Hilly/Hoodeng

When I replied to this post...it was the first one I'd Read....bad me for not scrolling through...or bad red wine...lol