A change if i install this controller on my stock Z8 ? Or i'll need a mufller & an open air filter to actualy feel a change...

I changed only the oem air filter for the UNI as the pic shows...   

A change if i install this controller on my stock Z8 ? Or i'll need a mufller & an open air filter to actualy feel a change...

I changed only the oem air filter for the UNI as the pic shows...   

I don't think you need the ejk? But if you add a aftermarket more free flowing exhaust then yes you will need it to control fuel/gas ratio:

[2015 Z Force 800 53/Trail EPS]

Yeah I don't think changing the air/fuel ratio to something incorrect will help you..much. 

For us to change the air filter , exhaust and controller means about 1350 dollars. It is important not to know specifically if we win 1 hp to 5 hp amount. What we at least more complicated pesonalmente is that it can not make the arrest flame ( mesh) and keep the original pipette without the e.c.u. range fence

I have a few muffler sets when your ready to step up,

any brand on the muffler?  how loud are they?  I may be interested.

These slip-ons are custom made, not a name brand, this is the product of a few trys and is the best size and performance I was looking for. The sound is perfect. Nice low thump, the sweet sound of a v-twin. Controller recommended. 

shoot me a PM with price on it.  Interested for sure.