Induction, exhausts, springs, etc. for a 120 should fit the 110. 180 and 115TD springs are stiffer as the engines are heavier.
It's been said above really, but PTP are your best call for serious 1.6 modding. I would also imagine things which 1.4 ZR drivers tend to do will probably work on the 1.6 . Things like bigger throttle bodies and the like.
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