Might want to check your policy on that. Most say any unlisted (or illegal) mods will void the policy. The specifics on the driving/incident will have little effect on the outcome if that's the case, it's just the first time the insurer will check if the vehicle complies with what the policy holder has stated when raising the policy.
1.5L in the current models. The 1.6L was older Vitaras.
Oh yes, I forgot they were a 1.5, I keep on thinking about the old Vitara motors.
I've owned modified cars most of my life and they've never checked or said anything about my claims, not that I've claimed a lot. My experience is that the extra items generally aren't covered if the car gets stolen or crashed. If there's someone that would insure it with the turbo and the premiums aren't 5 times less than buying the new one again I suppose you would run with it. The main thing is that you're covered if you crash into someone else, but I don't do ridiculous speeds on the roads or drive erratically to get the wrong attention in the first place.
The full comp insurances are ridiculously expensive these days, I'd only have it for the first 2 years of a new car, then the value of the car goes down and your premiums go up, so then I go to a third party, fire and theft. Unless you got a full wank car with all gauges placed all over the dash and things that are hanging out of the bonnet that stand out and almost poke your eyes they'll barely flinch when you claim and it's the risk that I'm prepared to take. As a mechanic, I can clearly say half of the cars out there on the road aren't up to roadworthy condition, incorrectly rated tyres and rims fitted, worn suspension components, oil leaks, modified intakes and exhausts, chipped computers and Etc..