
Please don't do it -there's absolutely NO need. You are getting a breed that matures very slowly so why the rush? Presumably it's going to be an indoor cat anyway. You will find your average male Exotic is not interested in calling queens until about 10 months old if that -I have one aged 2 who still has not mated -that is of course despite me wanting him to! They are not bad sprayers either when entire until much older, if ever. I'd say neuter at 8-10 months of age.
Lots of breeders and vets neuter at 13-14 weeks, (the reason is simply to stop people from breeding, nothing else) I did it once and never again -it was sheer cruelty with the poor kitten suffering badly as result (he nearly died) and he was so terrified of being handled after his experience I had major problems as he was a Persian and obviously needed regular grooming. Still today (aged 4) he's terrified of car journeys after that journey to the vet -I've even had to stop showing him because if it, and he's my top winning cat ever.
I have a very wellgrown 7 month old Exotic male kitten here in the house, surrounded by calling queens, he's not the slightest bit interested yet. Exotics are slightly quicker at developing than Persians are but all in all the two breeds are probably the slowest maturers there are.
(I've bred Exotics since 1994 and Persians since 1989.)