We purchased this beautiful S4 completely stock and was anything but when it was sold. The timing belt and water pump were due for service but we decided to pull the heads for port and polishing in the process. We also ported the intake manifold, installed upgraded headers, high flow cats, Borla exhaust, billet aluminum diverter valves, GIAC stage 2 ECU tune, steering column boost pressure guage, S-flow intake, and a custom front mounted intercooler. We finished it off with a rear spoiler and front euro plate. This baby is a sleeper! Estimated HP 365