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I had a 50 shot nitrous on my 1.2 16v it cracked the plasic plenium first making oil leak everywhere then it shot a piston that was only after 5 bottles of gas.
part number is 60 00 073 669 ENGINE MTG for the pictured mount. its about £55inc vat
I would also get the lower dog bone mount aswell its £31 part number is 82 00 103 802 SUPPORT
In the picture tht mount is normally ok, it is supposed to have some play in it. if your getting knocking then its most likely to be the lower gear box dog bone mount
how much does the engine move , put the hand brake on, in 1st and lift the clutch slightly get a mate to do this while you look on how much and where from the engine is moving.
a loud knocking when accelerating is more than likley the lower dog bone engine mount
cams- dbilas in germany can regrind them for €150 including return post
Decat - free up some power free (knock the internals out of yours)
exhaust manifold £250 from ktec replaces the crap cast iron one free up some power
exhaust system look at sound good
for all the money spent above you...
its a t**t of a job to change on the 172 but its only once a year.
The hard part is getting at the bolts from the back you need a bendy extention bar and a spanner on the other side. ideally you need it on a ramp to get at it properly.