Suspension, Wheels, & Tires.
To keep the handling aspect of the car in balance with the added hp, modifications were made. The suspension was fairly well sorted from the factory using Bilstein struts so B&G lowering springs were added to drop the ride height 1.5" as well as stiffen the ride.
Wheels were switched to Rays Engineering LMGT2 18x10" from a Nissan Skyline 400R. These wheels had a +26mm offset which will only fit with the RS4 widebody.
For tires I went for the Michelin Pilot Super Sports in 265/35/R18.