2 of 2 compatibility entries for Honda
Direct swap for B-series engines. EM1 transmission offers better gear ratios than standard EK transmission.
The draw of this swap is the factory limited-slip differential in the K20Z3, which the base RSX transmission lacks. The gearbox does not bolt in as-is: it requires the RSX speedometer ring gear, an RSX vehicle speed sensor fitted into a bored and tapped case, an RSX shifter mechanism, and an RSX shift cable holder. Two of the shifter mechanism's mounting points and two of the cable holder's holes line up with existing threads; the remainder can be drilled and tapped. A base 2005-2006 RSX does not need the vehicle speed sensor machining, but the shifter and cable holder swaps still apply to any year running a Z3 transmission.