No tune, but the car may not operate properly when you let off the gas. if you search the forums here you’ll see other members have successfully installed this valve and you’ll also see why a true blow off may not be recommended and why the Juke comes with a recirc or divert valve stock.
Honestly man the only mods worth doing untuned are an axle-back exhaust and wheels/suspension. Messing with anything on the intake-side or cats will reduce performance most of the time. Don't care what anyone's "butt dyno' says about how the car feels better after installing a BOV or intake. It's pure BS
Anyway yeah I wouldn't mess with it unless you're tuning for more PSI
I had the exact BOV and it will work and makes a loud sound. Just have to make sure it is really tight, have to put about 4 - 5 washers to make the spring stiff or it will cause a vacuum leak from the atmosphere side plunger not sealing. I ended up selling mine and buying the GFB Mach 2 TMS full recurc and am loving it. Overall quality seems much better and don't have to worry about vacuum leak. Hope this helps.