I took my car to the local tuner today and told him I wanted to convert my exhaust system in to a 2,5" system with a racecat, I also said that I wanted to remove the precat. He asked me the if the precat had an lambda sensor, I told him it does. He then informed me that my car maybe would go on the fritz if I removed the precat due to that the lambda sensor was expecting a different value.
If I swap the precat for a decat pipe will the ECU go nuts?
I'm sorry for my english, I'm swedish and it's late