Are there any routers out there that i am able to change wireless speeds?
What do you mean by "changing wireless speeds"?
Sorry, i have people that hog the internet with the wifi. So if i can say limit the speed to x kbps
OK, so you want to limit the speed specific devices get when connected over wifi?
Create a "Guest Network" for all users you want limited and reduce the maximum speed on that network only. You then obviously connect to the default network which is unlimited.
I've done this with a TP-Link Router.