420d Tuning Questions

Hello!

I have a 1999 420d, it's the non intercooled model with mechanical injection.

I've been told that I can't do any digital tuning as the ECU won't recognise it, such as digimafam or tuning boxes.

So far I've done an EGR delete, i've ordered a stock intercooler, later model turbo and decat pipe.
I'm finding it very hard to get hold of an aftermarket back box for this car.
I'm assuming anything from the 45/ZS hatchback will fit?

I've been told that I need to increase the air intake, and then increase the fuelling. I know this can be done with the max fuel screw, but I also want to upgrade the injectors, and been told that I would also need to upgrade the fuel pump.

Can anybody recommend an upgraded fuel pump? And also if anybody knows where I can get a less restrictive back box from, please let me know.

Any extra information on tuning these models with mechanical injection would be great appreciated.

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420d Tuning Questions