Continuing from last nights jet kart post....why dont we just add on of these to the trunk?
 

Mount it maybe where the spare used to go or just in the trunk area..... I mean the S4 would look like it had a fart pipe mounted in the center but the way I look at right now, that might be okay. (others behind you in traffic may feel that way till they see flames shoot out) An extra 70hp + 140 pound feet of torque would be nice. And its not like your dealer could say it was an engine mod...... Keep the warrentee banditos at bay....

Even for another car like a rear drive vehicle no traction issues since its pushing the car...<ul><li><a href="https://forums.audiworld.com/s4/msgs/1801754.phtml">https://forums.audiworld.com/s4/msgs/1801754.phtml</a</li></ul>