Greetings from a fellow S13 fan!
I posted my setup a few days ago, thread is here. This setup was done on a DS3:
https://www.gtplanet.net/forum/showthread.php?t=281386
Also try looking in the general drift setup thread (generally when people ask for car setups everyone refers them to here - don't take offence if people reply to your thread asking "did you use the search button?", but it is considered good practice to search before starting a thread):
https://www.gtplanet.net/forum/showthread.php?t=135527&page=4#post4310938
The S13 is quite a common drift car, so there's probably loads of random tunes for it on other sites too.
How long have you been drifting for? I've been drifting for a year or so, and as you see from my S13 tune it is low on power compared to some others. I still enjoy underpowered cars and would highly recommend them - IMHO they can be more of a challenge than high powered cars in some ways since you have to do more work with the steering and braking as opposed to relying on lots of grunt.
Cheers,
Bread