I have a 2008 concours,2brothers ex.,k&n air filter, and flies removed. What will I gain in HP and fuel milege by adding a power commander. Also what is the difference between the PC and a juice box.Thanks

You running stock header w/cats?

stock header w/ 2 bro. slip on

Can't comment on the juice box, never used one. With the exhaust still restricted your main gains have already been realized.  An FI modifier will give you a better A/F which will increase mileage somewhat. A PC V with Autoune will give you as good as you can get without dyno tuning. An ECU reflash is another option.

Gentle reminder for all....it really helps to have a descriptive subject line.

Better fuel economy, more power.....

On my 08, I gained a lot of lower rpm smoothness.  That range as you leave a stoplight at normal speed.   Removing the files gave the bike more power, but the pcv made the power feel much nicer.  Fuel mileage is up as well, by abotu 5-8% IF I lay off the throttle.

Based on what I've said, if it somehow turned out the pcv was taking power away (its not, but IF), I would still run it. The improved low rpm response if great.

For me it wasn't the gain in hp but the peace of mind knowing the fuel ratio is correct.

Thanks, Im still new @ this so im learning. I do know that removing the flies was a great improvement. Im getting 40-42 mpg at present riding 2 up and Ill be ordering the pc soon. Again thanks