Do some more research. With a newer car (p11) it's most likely going to be a lot easier to add a bolt on kit rather than a whole new motor. With the newer car your current engine should still be running strong and shouldn't have too many miles on it either.
Something like a modified Hotshot or F-max kit would be your easiest option. Or you could put together a custom kit, but that would require a little more knowledge, and depending on your wants it may not be any cheaper and it's definitely more work.