5.375 final drive ratio with stock T50

[4000GT]

I am actually running a plenum...

Here is the motor spec

Custom header (SS 304 in 1.5" diameter primaries and 660mm long, to a full 2.5" SS 304 exhaust, DEI header wrap
Custom Aluminium intake with CNC backing plate with built in 45mm velocity stacks.
3SGTE injectors
Coil On Plug ignition
Sliver top block (I grenaded a Black Top one) with balanced crank, ARP Bolts throughout, ACL bearings, Tomei rods, custom CP pistons, 15:1 CR.
288 degree 10mm lift Kelford Cams
Supertech 1mm OS valves, Supertech Valve Springs
Excedy Lightweight Flywheel
Setrab oil cooler and TRD oil filter with HKS adapter off the block
Moroso catch can (shortened to meet regs) with K&N filter
Half size radiator with alloy shrouding and electric fan
K&N 4" cone filter
TRD 0.8mm headgasket