Sorry OP, that was my fault suggesting weight loss. As above really, these are really limited. I think having read around port matched manifolds, larger throttle body, Catcams, virtually straight through exhaust and remap you *may* see 230bhp but I would say peak power would shift and its already high at around 7500. Its a bit of a testament to show how much Renault have evolved this engine.
If you got rid of one of the cats a remap may get 5bhp. Not about power increase, itll make it smoother as they naturally have a flatspot at 2-2500 which is emphasised with a decat.