Ok, so i have a 98 integra gsr with sealed power brand .20mm+ pistons that are supposed to be 12.5 to 1 comp(cast). Paired with that is a 99 civic si head. I've got a few bolt ons; msd wires, aem intake, dc headers, bbp n1 system knockoff, act 8lbs flywheel, exedy stage 2 clutch, dc 4-2-1 headers(soon to be replaced with 4-1), and a b&m fpr and guage(stock psi). I have a cel but its always one code, system too lean bank1. It's not the o2. i have a small crack in my header though. do i need obd1 jumper and p28 with a tune? 
