Cow Boy Cactus

[herbie]

Hi All
I bought a cowboy cactus roughly 6 months ago it is in full sunlight,when purchased it had 2 trunks ( i should say i also bought 2 others at the same time for freinds and they are still exactly the same) mine however has gone mad and is producing new trunks almost on a weekly basis the first 1 is now approx 4ins and the others are catching up fast even the new trunks have babies somone told me i should remove these and repot them??? it looks really good but am a bit worried that if i let it keep going at this rate it will die,it is in a 8ins pot which is the biggest i can get on the window ledge should i repot and move it or just leave it??? i dont normally have much luck with houseplants and am quite proud of it any advice gratefully received