Hey Emmanuel, no problem! I am actually running that setup right now for winter. In case you don't know, 2G TL wheels are 17x6.5, and CL-S are 17x7 - they are not the same even though they look very similiar.
I have the CL-S wheels (5 spoke), and stock tire size that came on those was 215/50/17. If your buddy has 2G TL wheels, 205/50/17 may be right.
If you're unsure what he has, just look at the back of one of the spokes.