Order a new exchange differential or rebuild from Diff Lab and receive free delivery of the new differential, and free pickup of the exchange differential. That is a saving of around $75-100. Only partner workshops qualify for free pickup and delivery. Choose a trusted workshop for your performance vehicle.
Applies to all full rebuilds, new differentials, exchange differentials and LSD upgrades.
RX Automotive can often swap differentials as a same-day service so long as the new differential is ordered ahead of time. The cost to swap differentials in most BMWs is around $300-400 plus oil.
Check out Simon Harrex racing one of the RX Automotive E30s in QTCC Group B round 5 of 2018.