Well - I'll throw in my tuppenceworth.
What if they cant get the bigger one to start with ? I don't know anything about the VX diesel engines to be honest.
And if it applies to them - why do any of the 110 / 120 ZS boys tune theirs up ? Why don't they go for the V6 straight away ? Why bother with all that mapping, VVC bits, decat bits etc etc ...
If they've got a 1.7 - and they are happy with it, and they want to tune them a bit - up to them - and good on them for trying.
Not saying that starting with a bigger engine isn't the most sensible way - ofcourse it is - but - let them crack on if they are happy ....
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