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Insurance-wise, ok to upgrade my BMW?

BMW performance related question: if I install the performance enhancement offered by BMW, which increases 2.0-litre engine output from 184hp to 197hp, does this invalidate my insurance? If I inform the insurance provider of the changes it may increase the premium or not provide cover if the car does not conform to homologation, etc. Thoughts?

Hold onto my Saab or change it?

I have a 2005 Saab 95 (2.0t) petrol automatic with about 136,000km on the clock. It just failed the NCT on emissions with "smoke". It is apparently a problem with the turbo (burning oil) and between that and a few other more routine issues it looks like about €1,200 to sort. The car seems to be running well otherwise, but I'm worried that there might be other issues around the corner.

That's the background - my question is, should I hold onto it and get it fixed or... bite the bullet and go for a change?

2007 BMW 520d or 2008 320d Coupe?

Hi,

I'm planning to purchase either a 2007 BMW 520d M Sport automatic (M47 engine) or a 2008 BMW 320d Coupe automatic (N47 engine). I've heard the N47 engine is prone to timing chain issues. Does that only occur when it reaches high mileage? Or overall is the 520d a much better car because I just need some pros and cons before I buy either one.

Sandra.