I am contemplating a new S4 but had a few questions first. How easy are they to mod to say 400 hp safely and or low to mid 12's in the quarter? How much suspension work is really needed or is any needed at all? Where in ATL does mod Audi's? Some pretty simple questions but I have been in to the Japanese tuner market or atleast a fan for the last 12 years. My last car was an modded evo VIII which I absolutely loved but a little to harsh of a ride and to much attention, want some comfort and style with speed hence why I am here. Thanks ahead