EJK controller needed for a drilled stock exhaust?

[eraser8]

Hi Guys,
 
The title say much everything. Does this would be better to put a fuel controller on my bike if I decide to drill some holes at the back of the exhaust (I think it was 6 holes of 1/4 or 3/8)? I saw couples of video on youtube and the sound seems to be not too bad ( cheap sound solution ). But I also want to take care of my bike if the pressure change, if this could be bad for the engine...
 
Does anyone experience this with and without controller when using a drilled exhaust?
 
Thanks

[duenan]

In my mind, no backfire = no fuel controller.
 
But I'm also obligated to say a fuel controller would help out and make a noticeable difference even on the unaltered, stock exhaust.

[eraser8]

In my mind, no backfire = no fuel controller. 
But I'm also obligated to say a fuel controller would help out and make a noticeable difference even on the unaltered, stock exhaust.

Thanks Dunan for the answer. 
Do you think the difference worth the price? I mean, I'm from Canada and with the exchange rate, It will cost me at least 350$ CAN to get it....
 
Does the EJK controller smooth ALL the range of throttle? I mean from 0% to 100% of throttle load to make it more smooter at every range?
 
Thanks