The HKS Fuel Controler is also a good choice I believe. I think it does everything the Apexi does. Also, PJ uses a Fields Fuel Controler that works similar to the Apexi as well. Both the HKS and Fields controlers are in a much smaller package than the Apexi as well, so mounting is a little easier.Dave C ver2.0 said:Bayou Performance for the Stg II ECU upgrade but read the threads about quality problems (see the sticky). Apexi S-AFC for fuel tuning. That's about all there is that's worth playing with.
Or you could pay $$$$ and get the AEM programmmable ECU, but they don't have a plug and play for the Legend (yet?) so you have to buy the race unit and do a hell of a lot of wiring and then put in mucho dyno time. I'd expect the installed and tuned price to hit around $4K.