Hi all.

I've read loads of stuff about self fit tuning units for diesel engines.

They promise more power and torque, same or better fuel economy, engine
stresses well within manufacturers tolerances - all for under £400!

If they're that good, why doesn't everyone fit them - or why don't the
manufacturers fit them as standard?

Has anyone on the group have first hand experience of these units? Are they
as good as the manufacturers claim?

Has anyone here fitted one and told their insurance company (or perhaps it
was a "friend" or "someone you know") if so, what was the effect on
your/their premiums?

I'd be very interested to know.

Thanks - Grahame.