The Autech runs an R33 GTR driveline, bilstein sus, big brembos and rotors. They have extensive body bracing. Is manual only, and are fantastic to drive. They are a basically an RS4 bought brand new from Nissan (hence RB25 build plate) and modified by Autech and still came with Nissan warranty from new. Around $110000 AUD new. Very rare car, still waiting on build numbers from Nissan. If anyone has the build numbers I would love to know.
The interior is much nicer as Terminal pointed out. Great seats and a sportier trim.