1996 spider 6spd with Tubi headers, hyperflow cats and stock exhaust. All new o2 sensors. I have had this setup for a while, but I honestly haven't driven many miles and very few (if any) trips over 30 miles. Yesterday I went about 60 miles on the interstate (in pouring rain) very easy driving. When I pulled off the interstate and slowed the CEL came on. Pretty sure I recall a pending code years ago when I first put these on, so I guess it finally upgraded to a CEL. The code is both banks, low cat efficiency. Did some reading last night and this seems to be a common issue. A read about a few fixes: 1. reset CEL and dont worry about it 2. Post cat o2 extenders 3. add ground wire from o2 sensor body to a ground 4. OEM cats OEM cats are out for now. I dont mind resetting, but would like a work around. Anyone have any experience or thoughts on the ground wire or 02 extenders. Other than the pouring rain, CEL, flat spotted front tires, and no A/C the car ran great! These things punish you when you let them sit!! FWIW, the clutch pedal had a tiny "bump" right at the top of the release. It was very smooth except the very last bit. I had just flush the fluids, and didnt see any leaks. I gently eased back the master boot and squirted a tiny bit of lube on the shaft. Fixed it. Thanks guys.