BNR S4 Turbo Kit Mazdaspeed 3 2007-2013 | Mazdaspeed 6 2006-2007

BNR Supercars has several bolt on turbo upgrade options for the Mazdaspeed 3, Mazdaspeed 6, and the Mazda CX7.  These turbo upgrades are designed to be a bolt on replacement for the K04 factory turbocharger. The stock K04 is a throw away unit that shouldn't be rebuilt. The weak points of the K04 is the long shaft length, small shaft width, and thrust bearing design. BNR's newly designed replacement/upgrade far overshadows the K04 turbocharger that comes equipped on the Mazdaspeeds.

The benefit of the BNR turbo upgrade for the Mazdaspeed 3, Mazdaspeed 6, and Mazda CX7 is the increased shaft size, shorter shaft length, bigger bearings, better thrust bearing assembly, better turbine wheel, more efficient compressor wheel, and last but not least, more reliability.  No question this turbo upgrade is far more superior to the original equipment turbocharger on the Mazdaspeed MZR DISI.

Bolt on! You read that right, it says bolt on. The BNR is a bigger that stock turbo though it still fits withen the factory K04 frame and is therefore one of the easiest turbo upgrades to install. This Mazdaspeed turbo upgrade is for the customer wanting to reach the limitations of the stock engine without killing turbo response! 

Don't judge the BNR S4's book by its cover. Just because it is roughly the same size as stock doesn't mean stock like performance. The BNR S4 has proven itself worth of hanging with its bigger counter parts while maintaing lightning quick spool and transient response. If you want more power but don't want to sacrific the quick spool of the stock K04 on your Mazdaspeed 3, Mazdaspeed 6, or CX7, the BNR S4 turbo upgrade is the turbo upgrade for you!

*Current version features a 3.5" inlet with revised anti-surge compressor housing.