Hi please can anyone tell if and where a dump valve would fit my fab is a 1.9tdi 100bhp elegance

im not so much bothered about sound i was told it would stop turbo lag

There is no need for a dump valve on a diesel.

Lag? On that size of turbo?

The way that diesels work, a dump valve will not do anything at all if you fit one. This is because a diesel does not have a throttle valve and does not restrict the airflow into the engine, unlike a petrol one. There is another explanation here: TDIClub FAQ - Blow-off valves or BOV or similar The rest of the FAQ is very useful as well.

You can fit an electronic operated dump valve, this will produce the sound of one but will not do anything to the performance of the car. I have even heard they actually decrease performance slightly when gear changing, and could damage the turbo, as it dumps more pressure than it needs to. This is what an electronic one will sound like: