The BNR S4 is the most popular turbocharger in the MZR market! The S4 will max out the original engine and has enough on the table to make 490 WHP with Auxiliary fueling. Great response and amazing sounds come from this unit! Makes a great entry level turbocharger for built engines.
- 3071 Gen 2 CHRA Rated at 56 lb/min
- VSR Balanced
- BNR Upgraded compressor housing with Antisurge port
- Heavy Duty 15 psi wastegate actuator
- Heavy Duty wastegate swing valve construction
- 30 mm wastegate port
- .72 a/r turbine housing
Install kit includes:
- 9 M10 1.5 staintless studs
- 9 M10 1.5 stainless nuts
- 9 M10 stainless washers
- 2 M12 copper sealing washers
- 4 M14 copper sealing washers
- 2 Oil outlet gaskets
- Stainless MLS turbine inlet gasket
- Stainless MLS turbine outlet gasket
- Firewall side extended stainless water line
*Divorced down pipes sometimes do not work with our turbocharger upgrades! If they are used, the wastegate valves sometimes doesn't function properly causing extreme high boost conditions!*
- Year:
- 2006/2007/2008/2009/2010/2011/2012/2013
- Make:
- Mazda
- Model:
- 3/6
- Submodel:
- Mazdaspeed 3/Mazdaspeed 6
5 Reviews
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Best Mid size turbo by far!
Absolutely pleased with the turbo, pulls hard and sounds amazing. Very please with how it all turned out. Thank you Edge!
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Boost Creep machine.
I'm getting 23.2 psi with 0 wastegate duty cycle. 20.1 with the actuator arm disconnected and the wastegate wide open. I'm stock block on E30 trying not to go lean. Avoid this turbo, find something with an external wastegate. Yes, this A new version 3.
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This turbo is a must , while different experience
If your considering a turbo upgrade , this is the turbo to go with. It's a great deal and price complete bolt on. I was debating between a bnrs3 or bnrs4 and am glad I got the bnrs4. Don't waste your time looking at other options , if you looking to stay within stock block or beyond stock block limitations this is the perfect turbo. I'm on a base map at 17-18 psi and this turbo pulls.
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Great Power, Good Price
Followed the installation video that Edge made, including removing the exhaust manifold and it was relatively pain free. Love that it retains the turbo mounting bracket and OEM heat shields. Spool is slower than a K04 but that is expected with a larger turbo.
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Pulls so Hard! OEM appearance
Turbo is a total sleeper! Sounds amazing when spooling, and even changes exhaust not at idle. Still haven't finished tuning,, though I'm faster than what I was with the k04 on 20psi and full tune, and that's only on 17psi!
