The airboot is just too small for the fcr carbs and risks developing air leaks. I urge you all to fix it! You'll need a heat gun, round tapered drinking glass, some oil, gloves. Remove your air boot, heat the lip until it's extremely hot. Don your gloves, oil the bottom of the drinking glass and jam it in as far as you can. Let it cool on its own! Don't rush it because youll shrink the rubber back down to its original size if you cool it too fast. Remove glass after its nice and cool. You'll need a new hose clamp, but wow it's worth it and you won't get angry installing your fcr anymore. You're welcome.