Hi, I've been reading a lot lately on this forum about the pros and cons of re-mapping. I have to say I've probably confused myself by doing to much research, so I will keep it simple.

How does re-mapping increase BHP and yet improve fuel consumption? Will it damage my engine? And where can I take it near to Stockport?

I realise thats three questions in one but I would apprechiate honest sound advice.

Oh I nearly forgot, is it expensive?