You don't need an S6 Plus to do a V-8 conversion of an I-5 S6- the S6 in Europe came in 2.2L I-5 and 4.2L V-8 models. All you need, really, is a S4/S6 4.2 front subframe, motor mounts, etc., along with the 4.2 longblock and possibly the transmission depending on the bolt pattern of the trans. Taka