Hi all

I've been thinking about this for a while now and would like some opinions essentially im stuck between the idea of getting the 123d twin turbo engine or part to convert my pre LCI 520d to 23d spec or the much cheaper tuning box which will give me similar power.

The engine gives out 201 Bhp and 400Nm
The tuning box gives out 204 Bhp and 435Nm

while the figures lean towards the box i realize with the engine it paves the way for other mods.

I guess i'm asking if anyone has tried the engine route and are 2 really better than 1 when it cones to turbos.