please need help: F4RT vibrating hard at 5000 rpm and over

[Marco 48TK]

hello,

i hope people can help with my problem.
i know its not a clio but still a renault sport.( have 2 clio 172 aswell lol)

i own a megane 225 trophy and by my known it never had this issue .
its been a long time a went for a spirited drive (due to weather) but if i rev to 5K rpm and over the engine starts vibrating quite hard.
i own the car for more than 5 years and by mine known it never did this.

maybe its normal cause 5k and over is quite high rpm and its a turbo engine (lower rpm powerband).

i always put premium petrol (98 octane ) in the car sometimes with injector cleaner.
just had a new cambelt with renault locking tools. injectors never been replaced by my known , and coils i dont know. spark plugs are like 10000 miles old at max ( need replacing at 30k)
it doesnt use oil or coolant last time i checked.

engine mount at cambeltside has been replaced 3 years ago ( or so)

engine mods : open airfilter, mid silincer delete (for over 5 years already )

i think its something engine related and on 1 hand want to keep testing it what it is, and on the other hand i dont want to blow it up.
so i come to here for advice cause some of you have more experience multiple engines etc

hope someone can help me .

greetings marco

 

[Marco 48TK]

addition : the exhaust sound at idle sounds smooth not spitting

 

[Mr Trailer Man]

Dual mass flywheel at a guess.

 

[Brigsy]

As above knackered dmf at a guess. The engine should rev to the limiter without issue.