I bought my 01 integra about 4-5 months ago. It still has the b10b1 it came with but it has some mods. I got it from my brother in law and he didn’t even have it for 2 weeks and sold it to me since he needed money and my previous car turned into my new project car. The problem with my car is that it has aftermarket headers, and a new intake manifold as well as a cold air intake. It has 1 cat but the previous owner (before my brother in law) gutted it. It also has a after market exhaust since the one it had still had the oem muffler and resonator but they were rusty and had leaks so I got a yonakah exhaust. The car runs great and drives great and sounds great but I realized that it’s running piggy rich. It also stutters at idle. I’ve done the basic maintenance as well as changed all of the plugs and wires but it’s still running piggy rich. Any ideas on why it’s running rich and what can fix it? I’d like the keep the current set up as I don’t want to go looking for stock parts and i like how it looks/sounds. I’m just learning about cars and I’d like to be a mechanic but I need to learn so any help would be amazing.