All 306 HDi's have Bosch pumps. As Steve says, Siemens stuff only appeared no the later engines and some commercial stuff, so unless your car has had a full engine and ecu transplant it'll be a Bosch.
These pumps can't be turned up or down by hand, it's all done through the map. If yours had a chip on it it's unlikely to be mapped as well, especially if you're complaining about it being sluggish. There's a chance the chip has knackered your fuel system faster than would otherwise be the case, you need to get it on PP2K or some other decent diagnostics really. Where are you based?
These pumps can't be turned up or down by hand, it's all done through the map. If yours had a chip on it it's unlikely to be mapped as well, especially if you're complaining about it being sluggish. There's a chance the chip has knackered your fuel system faster than would otherwise be the case, you need to get it on PP2K or some other decent diagnostics really. Where are you based?