Ive got an ethos full system with a few little dints in the pipes and wondered if there was a way to repair this also the cans got a rather big dent in it can they just be resleaved?

You can get dents and dinks out by sealing the can and putting 50-60 psi in it. And heat with a good blow torch / oxy- acetaline

I take it the can is an Aly one?

Might be worth drilling the caps off and trying to knock it out from the inside. Ultimately it might be better to get it sleeved.

Where are the dinks in the pipework?

Where it comes down from the rear bank where ud have a heat shield standard behind the right rearset