HKS just came out with a newly designed exhaust system for the Subaru BRZ and Scion FR-S. This is a different design than the original Spec-L Hi Power exhaust that HKS put out but comes with beautiful Titanium Tips. Some specs are below.
Stock weight: 18kg
HKS weight: 10.4kg
TIP OD: 97mm
Main Pipe Diameter: 60.5 --> 50.8 x2
Fits 13+ Subaru BRZ & Scion FR-S