I have found someone on ebay who is selling info on tuning a 306 dt engine by upto 30% bhp and more torque just by adjusting the fuel pump settings and slightly raising the boost pressure. According to him it is safe to do as it removes the low settings built in "this being the slack" in the performance of the 306. Has anyone done this kind of mod? Im thinking of it but seeing as mine has done 209k im abit reluctant to do so. Thanks.