Hopefully members will be a little more discerning than just looks and colour; so more importantly what are the piston area choices, and how do they compare to previous kits, and also to OE?
They are used on the worlds fastest production car around the Nurburgring and the worlds fastest street legal dragster, so probably good enough for the GTA and I guess slightly better than OE. Alternatively you could save £100 or so and use some secondhand stuff off an old Peugeot
Basically they are the same as before just prettier, we recommend the D (4 x 38.6mm) piston option for GTA.
Tech bumph (FOR THE LOWEST SPEC CALIPER)
Application
The Billet 4 is fully dust sealed and an internal brake fluid gallery ensures that the Billet 4 is a consistently reliable choice. This superb caliper will accomodate disc/rotors from 240mm up to 400mm.
Features:
CNC machined out of top quality billet aluminium
Hand finished and hand polished for the best finish
Rigid design to eliminate flex
Internal Flow Crossover
High temperature seals
Fully Dust Sealed
Designed for cars up to 1250Kg
Specification:
Disc Width: 6mm up to 35mm
Piston Size: 4 x 34.6mm; 4 x 38.6mm; 4 x 41.2mm
Piston Material: Hard anodised billet aluminium
Colour: Black, Blue, Gold, Silver, Red, Economy (Silver matt finish with plain Logo)
Body Material: 6082T6 billet aluminium
Pad Swept Area: 95.68x50.7.7x10.75mm
Weight Approx: 1700g
Hydraulic Thread: M10x1.0
Radial Mounting: 152.40mm
We would recommend external fluid transfer for race use or a 0-60 time of less than 1 second

Trafic, Twingo GT, Vel Satis Turbo x 2, Clio V6 Proto Ph2, Vel Satis 3.5, Avantime, Alpine A610, GTA Atmo x 3, GTA Turbo x 3, R5 Gordini Turbo Mid Engine, Alpine A310 4cyl, Alpine A110, Yellow Smart