Used, but in great condition. Tested in my car, works fine!

It's just the chip! No ECU... Comes with 2x20 pin to solder and then fit into your own ECU. New price is 199, asking 150 shipped.

S14 23710-74Fxx (UK cars)
S14 23710-75Fxx (European cars)

The S14 Stage 1a ECU upgrade chip is designed to optimise the fuelling and ignition for an S14 with the following modifications:
Free flow air filter
Free flow exhaust
Uprated fuel pump
Boost controller to achieve 17psi peak boost pressure
Front mount intercooler
Super unleaded fuel (>97 RON)

Benefits of using this ECU upgrade chip include:

Fuel cut removal
155mph speed limit removal
Smoother power delivery
Increased fuel economy when cruising
Can be remapped in the future for almost any specification at great prices at Horsham