Drivetrain upgrades

=Clutch=

Popular clutch upgrades. Power levels are estimated at the crank.

Stage 1 & 2 - K03

 * OEM RS4 clutch disk & RS4 SAC pressure plate. Older but very popular setup on K04 cars.
 * VAST stage 1 or stage 2 clutch kit
 * Southbend stage 1 organic (est 350tq)

Stage 3 - K04/RS6/FT/Tial 605

 * Southbend stage 2 organic/feramic (est 400tq). Very popular setup.
 * Southbend stage 3 kevlar (est 525tq)
 * VAST stage 3 organic/feramic disk (est 500hp/500tq)
 * Clutchmasters FX400 6-puck

Stage 4 - Tial 770/GT/etc

 * Vast stage 4 ceramic disk (est 540hp/540tq)
 * Southbend stage 4/5 Extreme (est 600hp)
 * Clutchmasters FX850 twin disk
 * Will engage more abruptly and produce chatter

=Pressure Plate= VAST, Southbend and most other single disk clutch kits use the OEM B5 RS4 pressure plate. An upgraded Sachs pressure plate is not a bad idea if you plan on lots of launching or more than 500tq. The Sachs pressure plate requires an extended throw out bearing

=Flywheel= Most people reuse the OEM dual mass flywheel. Your local NAPA or machine shop can resurface the flywheel, sometimes while you wait, for under $75. Use new bolts.

Lightweight, aluminum flywheel options
 * AWE aluminum flywheel - 13.4lbs
 * VAST aluminum flywheel - 17lbs

=References=