[Mods and Questions] N47 xDrive20d

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Hello all, it's my first time posting over here.

Would like to ask regarding my xDrive20d, Recently I had remapped my car, and the thing is, the remap is direct to the ECU. So if I added those piggyback like racechip or DTUK, will there be any further increment? Or I should just go for those Downpipes and intake ?..

I was planning to get this though,
http://www.rgsportshop.com/index.php...product_id=212

But my engine is N47, which they only stated it's for N20. Will it be compatible or I'll have problem with it?

Thanks!