2013 Civic Si
So I found my issue, I forgot to disconnect my iat wires from my MAF so it must have been reading the intake temps from the air filter. Also shaved the obd1 sensor and it works like a charm. IAT's are now 5-10* F above ambient!This is why i think your safe to shave the OBD1, your just making it react faster to change, not changing the offset reading. Old forums have alot of info on this.
If i wasn't going to retune, I'd shave mine. Since I'm retuning, I'm upgrading to AEM.