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Hi
I am far from be a specialist but I have a '95 E34 525tds Touring and the only way I know to improve the engine is without modifications is by a chip, BUT... the chip you might want is one that affects the diesel pump and NOT... the turbo if you increase the turbo pressure by a chip you will reduce is lifetime dramatically. There are a lot of manufacturers of tuningchips for the 525tds but in my opinion the bests are the ones that don't need to open the DME (where the original chip is), they have a separate box with plugs (e.g. POWERBOX) that are connected between the cables that came from the DME to the diesel pump, they usually increase the power by 30bhp but where they really excel is on the torque figures.
Hope this will help you. Best wishes from Portugal
Cmoura
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