OK boys and girls, does a mapped S3 even compare to an RS4? I'm guessing not, having been in a few RS4s, but the power is so immediate, so linear, maybe a forced-induction head-to head would be more appropriate? I also have a good friend with an S5 who wants to know what weight penalty he pays? Based on pretty poor maths, his S5 gives nothing to my S3 and both are getting to 60mph at the 5.5s barrier! N/A is the obvious next step, but do S/RS really command the GT-R premium?