I might be a bit late joining in with this post.  I'll be catching up over the holibobs

I have yet to take the plunge with a remap but I fitted a non-standard exhaust and daytime running lights a few years ago.  My insurer at the time declined to renew my policy on account of the mods.  However, I had no problem at all getting perfectly reasonable quotes from other companies through a comparison site having entered details of the modifications in the comparison.  I ended up paying about the same as before.

So, the tip that worked for me was to make the changes shortly before renewal.  Then, get on a comparison site once, or even before, the mods are completed.

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