Easiest n/a swap to do would be 5efhe. If you can find one. Then bolt ons flywheel head work n ecu, then strip the hell out of you car With out going custom engine conversion 150 160ish bhp is about your limit imo
Boxing them in would help but the main issue is they face the floor which sucks! Ideally you would want some 16cm ones in the doors but that means pods and wiring to be sorted. Easiest way to get better sound chuck some 6x9's on the parcel shelf or if you dont have one in a box behind the seats with a small amp to power them.
Hand sprayed and the lacquer cracked so looks like an old china plate and getting redone at some point Also sprayed one orange first then sanded it back afterwards so the speedline writing is outlined orange These ones are sprayed the renault clio cup anthracite but left matte