LOUDER
Alright, seriously now
Test pipes - I can tell the the exhaust travels much smoother from beginning to end. If not in the proper gear the drone can be deafening (wife claims a headache within minutes). Muscle car like idle.
Stage IV clutch and LW flywheel - RPMs travel up and down noticeably quicker. Surprising smooth and soft clutch depression (softer than any Audi I have ever driven). Engagement point virtually identical. Virtually NO CHATTER this is what I am most impressed with. You need to be driving like a retard to cause chatter.
Overall I can tell the car is a bit quicker/faster. I have yet to put on the 1000 miles on the car to really have a go at it. When I get those miles on and it properly broken in I will post some videos for all to hear the beautiful exhaust note ;D