SCR Corse Handmade 50/70 exhaust for Derbi GPR.
These are specified for the 2001-2004 GPR Race Replica but you can likely adapt these to multiple GPR models that use the EBE050 engine.
These exhausts are very nicely made. SCR Corse recommends using this exhaust with 50cc cylinder up to mid-tier 70cc sport kits.
If you want your GPR to have street-manners, this is the better choice over their Racing Line exhausts.