Right the other reason for the exhaust upgrade is the boost is to be up'ed soon
got a uprated mechnical diesel pump coming......off Tiz on EC-DC
"It has been built with a more aggresive camplate, a 10mm plunger/head. The govenor has been modified so it does not cut off your fuel untill 5400rpm. The boostpin has had a custom grind on it to increase fueling a lot more under boost and it has had a TDi timing cover on it allowing the timing piston to move further allowing further advanced timing""This pump will make some serious horsepower and torque on your TD. If you adjust the fueling and boost accordingly you will see 170-180hp easily"so next on the shopping list is
boost gauge
boost bleed valve
exhaust gas temp gauge
...
i forgot that Matt's uprated the front brake a while back
Brembo Max grooved disks, Mintex Xtreme pads........rear's don't need an upgrade, there HUGE on Caddy's