Screw mod

[[Death]]

just got myself a nice Peugeot 306 TD , whats this screw mod i keep hearing so much about? and how do i do it
thx in advance

 

[[Death]]

well put it this way, im a mechanic and ive never heard of it, unless its a fuel adjust or turbo pickup hehe, i tried google, couldnt find anythin

 

[[Death]]

haha surely it aint that bad, anyone kno where the screw is? any info

 

[[Death]]

thanks