The BNR S2 turbo kit is a great candidate for retaining stock spoolup characteristics but getting a handful more horsepower than stock. This is a slight upgrade from the stock Borg Warner K04 turbo and will flow more throughout the rpm range. Based on a Garrett GT28 turbo, this is a high quality, reliable upgrade. BNR turbochargers are bolt-on for the Mazdaspeed and come with all the hardware necessary for a smooth installation. The compressor inlet is 2.25".
- Mazdaspeed 3/Mazdaspeed 6