Make sure not to hook up anything to the ignition system...the 3/6/8 use pcm controlled generators instead of alternators...the power fluxuations are enough to destroy most aftermarket piggy back attempts at ignition tuning. A/F tuning works well though, but not much to tune on the 3. (It isnt' sickly rich like the 6s is).
The 3 has the 6i's engine...which gets to around 11.5:1 at 6500 rpm.
The 6s (3.0 V6) gets to below 10:1 at 6500 rpm.
The 6i/3s can obviously get some gain from AF tuning...but its not going to be ALOT, cause the engine is already running in a decent range stock vs something thats running PIG rich. (Like the v6 mazda 6s, which gains almost 20 hp from A/F tuning)
Also, is the 10-12whp I keep hearing about realistic?? I didnt think these cars ran that rich...I've also heard this on the 6, but not for the 3...then again...this is the 1st time I've seen anything on tuning the a/f on the 3 so.....