S14 Turbo and automatic S15 turbo is the exact same. The S15 Turbo found on manual models is the "upgraded" turbo. So if you buy an S15 turbo, make sure the part number is 14411-91F00, this is the good S15 turbo number. Anything like 14411-75F00 or 14411-69F00 would be an S14 turbo.

I got this off another forum But I think it is good info.