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I'm considering adding a whole PLX gauge setup with AFR, EGTs, more temp probes, their OBD-II module, the works.... while it's nice to know your AFR, I can test this periodically with my tuner's portable rig. "Aggregate" AFR is useful for tuning... if I really wanted diagnostic value, though, I'd need either AFR or EGTs for each cylinder - since the issue some of these cars seem to develop is "hot" or "lean" individual cylinders (whether due to unequal airflow, or a clogged injector, or whatever) - and you may not catch that if you're looking at AFR or EGT after all the header primaries merge back together....
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I'm Paul, The car is Blimey--- BlimeyCabrio's Blog--- 2006 MCSCa w/lotsa mods and Union Jacks
Ten-time Dragon Veteran - Occasional Trackrat - Extreme Twisty Addict - Rhymers Ferry Road Fanatic