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Message: <blockquote data-quote="Maniac" data-source="post: 606491" data-attributes="member: 20491">i think the tuning boxes do give extra oomph to the engine performance, as there was an improvement was observed with the vector set installed.i agree with carlsson's conclusion that tuning boxes do give you an added performance boost, even on the powerkit.  some of us here were sceptical that there would be any marked improvement, because there's a limit to what you can squeeze out of the same engine, but it does appear that the extra mechanical bits (intercooler & larger fan) does make a difference in providing a higher base for the PPK 320d to get extra output through these tuning boxes. in carlsson's case, looks like an extra 7% :top:but carlsson's monster has also already leapfrogged other PPK units because of his better airflow!  beware of this fella on the road, he'll eat you alive! hahaha!</blockquote>