Think you mean EGR & not ECU , but you might have cleaned it for all I know
More power, right where to start, yours is the Siemens system so HDi tuning are your best bet.
Me I did, Deep breath.
Mocal oil cooler
Large intercooler (made be yours truly)
Flowed head
Bigger maf
Hybrid turbo
New injectors
Re-built high pressure fuel pump R90
Moded high pressure valve
K&N panel filter
3" turbo back exhaust
ECUedit, custom map.
Result around 170ish bhp depending on the dyno
Went like a well mapped 2.2 16v HDi , a lot of work I know but most of it was done because it was in bits & seemed
rude not to
Now back down to around 150 bhp with less extreme mod's to sell her.
2002 110 HDi estate, Rapier in monaco blue! ( found quite a bit more power

) SOLD I've sorted the airbag light
1998 3.0 V6 SE coupe in Diablo Red ( my baby ) sold
2006 206 1.4 16v sport in Aegean blue ( wife's shopping trolley

)
2006 BMW e61 535d m-sport

run's for cover
