I have a B18C jdm in my crx. I bought the engine and had it put into my car. I found out that when the people did the swap that they didn't change out the o2 sensor from the orginial crx. I need to get a new one but does anyone how much this is holding back the car. I only ran about a 14.2 on 1/4mile. Second question, I have been researching more on the engine. I thought that it was a gsr. after looking they were saying that it could be a sir. This would make a difference in horsepower, as well as parts that i may need to buy for the car?