Rex,

The first question I would be asking is how many KM's has your car done ?
The reason is that if its around 100, 000 km your probably looking at a new Air Flow Meter for your MY00 WRX.

That will be $200 straight away for a replacement.

From my previous post.......

MY 99/00 WRX/STI's Air Flow Meters are know to wear out and give un-reliable outputs eventually that can potentially fuck your engine very quickly. Verso, ECUTek, Power FC, UniChip all use the Air Flow Meter. Do you want to take the risk ?

Link, Autronic, Motec are tuned via Manifold Air Pressure MAP. Very Reliable.

Approx Costs Fitted and Tuned:

$900-1400 Link (Second hand)
$2400 ish Autronic (Second Hand)
$3000 Autronic (New)
$2800 ish Motec M800 (Second Hand)
$3600 ish for a Motec M800 (New)

Autronic has Anti Lag already on the board enabled.
Motec M800, it is a $275 enable option but has far far more flexibility (AVCS, Launch, NOS) than Autronic once you pay $$ and enable options.
http://www.capa.com.au/capa_performance_motec_m800.htm


Something to consider.....

J