I bet you that "detuned" iteration of the 3.0T is not THAT detuned.
I bet if you dyno it, the N55 and 3.0T make very similar power. The 3.0T in the S4 is said to be underrated and makes closer to 330whp. So all the detuned one would need to do is make 270-275whp to match the N55.
'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'15 Buick Regal "T"(wife)
'06 Saab 9-5 Combi 5mt (full suspension, LSD, clipped turbo etc)