Curiosity question :adding catted to an already tuned car

[SEI1977]

What would happen if I were to remove my catless downpipe and re-installed my stock catted downpipe. ???

The car has a pure 800 at 22lbs and an Ecutek tune ??

Would the car just run with less power ?Would it harm the turbo in any way ?? Would the boost level stay the same ??

thinking of trading in car and might have to install stock diwnpipe. Thank you

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[stormgreysupra]

You would definitely need a new tune if you add back the factory downpipe. Perhaps you could get away with a high flow catted downpipe, but I think it would still be recommended to get a retune.