[Robin]

Thought I'd ask in here as I'd prefer to buy parts from the UK...

I'm after a few things for mine, to see just how potent I can make it, I'd prefer to use genuine parts wherever possible, but I appreciate some will have to be aftermarket.

The main 3 on the list are -

Larger intercooler (330d? 335d? 335i?)
Larger turbo (I know the 6 cylinder ones are different fitments, so I'm not sure here)
Larger bore exhaust

The turbo is the main issue, I'm not sure how to go about getting a larger one, I know Alpina did something for the D3, using some BMW bits and some of their own, but can't find any real details on it.

Intercooler wise, does anyone know if they're the same sort of fitments?

As for the exhaust, I can have one made if needs be, but it's easier to buy one. Most of the aftermarket ones just seem to have a different backbox, and no real gain in exhaust flow.

I've got a couple of contacts in the trade from where I used to work, so I'll be having a word with Turbo Technics about the turbo, but if there's one available off the shelf, it'll be quicker than getting a used E90 320d one and giving it to them to tinker with.

Anyone got any ideas/suggestions?