Audi seats are HEAVY and are not that comfortable. (Worked on and drove ALOT of Audis of all models and types).
If your into seat swapping from production cars, may i suggest finding some cloth or leather Recaro mitsubishi evo 8 or 9 seats. They are all over the EVO boards for cheap (generally they are upgrading to one pieces which really is only for the bling factor). I picked mine up for $700 with 100 miles on em and they are ALOT more comfortable than the Audi seats and bolster WAY better. Just IMHO.