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So recently I decided to get a pro tune. The tuner mentioned I'm running lean and I have gone over the car and cleaned the maf sensor and intake tubing but still having issues. Anybody have some ideas to this issue? The short block was replaced due to last one have a cracked piston ring...

As stated i purchased a used Map performance catted downpipe and now have cel p0137 (low voltage). It's on a 2020 civic si coupe. Mods are ktuner, 27won intake, map performance stealth exhaust, and now a catted dp and fp. I have tried flashing to stock tune then reflash back to new tune. I've...