you dont have to use #23 you can use any ignition fuse or tap right off the battery if you really would like with a 20A inline fuse need #18awg stranded 105c for this job
Something to note though... The STI was much cheaper on the interior. After only a few months it was rattling in 3 spots. I will also not miss the horrible gas mileage. Believe it or not, this tranny feels better also.