i am installing CarSound cat's since my gutted cat's and O2simms pissed off the car. i was wondering if i put those high flow cat's on will that **** off the car computer too? will i still have to use the O2simms with the new cats? JEGS parts book says that you need to use the simms if you have headers or high flow cats. is this true or just a way for them to try to see more parts for $$. thanks
Randy