4.8i here. Drove the 3.0, but seemed like it was working too hard under my normal driving habits/speeds, and the sound of that 4.8 when it fires up is very rewarding. The 3.0TT gas would have also been a consideration to at least see if the power was sufficent had it been available, but since it was not, the 4.8i was the way to go without a doubt.