AFR gauge is cute, (honestly, what use are the numbers flashing by at full throttle??), but what you really need is DATA LOGGING. I hope this is part of your plan if you bother with an AFR gauge.
For street fun you can't beat:
B&B or GHL with heat
Tested and confirmed injectors/CIS system - are they evenly flowing and is the system correctly functioning?
and go have some fun.
If you go beyond this - track use, or more power/higher boost be ready for more stuff. The above will get you started and you will not need to replace any of it for future "upgrades".
3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno