HOR-RB-CAST-EXCH-no-rebuid kit


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front diff rebuild kit bearing seals

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Make 4 interest-free payments of AU$381.25 fortnightly and receive your order now.


Designed off the original Gibson Motorsport winning GT-R's, the Hi Octane Racing cast alloy sump extension is a must have for your GT-R with proven results in tarmac rallies, circuit racing & drag racing for many years, not to mention offer a safety net of extra oil capacity for street cars!

For many years the oiling system has been the achilles heel of the RB26 engine causing many catastrophic engine failures often the first time the vehicle ventures anywhere near a racetrack. The standard RB26 sump is barely adequate for an engine producing 206kw under road conditions. Once this horsepower is increased so too are the G forces and once this is coupled with sustained high RPM experienced under race conditions the standard sump will run low on oil and what little oil is in the sump will be splashed away from the pickup which usually results in engine failure. We have been manufacturing fabricated sumps for quite some time but these are both expensive and time consuming to manufacture, so we have introduced these cost-effective cast versions. The Hi Octane Racing sump extensions do not hang as low as other competing products so it is excellent for lowered cars.

We now offer a genuine Nissan front diff seals and bearings rebuild kit to update your well worn parts. This is highly recommended especially if you intend to install a new front LSD.


Note: When ordering this, we require you to send us a standard RB26 sump with the diff removed along with a stock RB26 pickup for us to modify and fit our cast extension to. This item does NOT include a core sump. This charge is for our cast extension and labour to fit only.

Fabricated parts are made to order and follow a manufacturing queue. Please contact us for the latest ETA.


  • Increases sump capacity to 8.5-9L
  • 3 swinging gates for superior oil control
  • Provision for oil return fitting

More info.

Make 4 payments of AU$381.25 over 8 weeks and get it now!