04 tune

[Toms04compg]

So i figured i have the money for headers. If i run catless will i need a tune or would it hrt anything without?

[TABSGTP23]

If you dont run a cat youll probably throw a code for the rear 02 sensor I reckon. Wont hurt anything really you will just have a service engine light on. I have aftermarket headers and kept my stock cat and no codes thatta way.

[Fivefingerdeathpunch]

He will have problem. 01+ cars use the rear o2 for fueling.

[Toms04compg]

Thats what i was thinking.... If i could of gotten away with it without kr risk or what not. It will be beneficial anyways. Thanks

[darkhorizon]

He will have problem. 01+ cars use the rear o2 for fueling.

No cars use it for fueling.

01-03 use the rear o2 to test the cat... it can cause issues as it keeps trying the test, which involves tossing tons of fuel at the cat to see how it handles it.

04 uses it for testing the cat as well, but it does not have as large of an effect like it does in the 01-03.

In all cases, this only happens at cruising speeds, and crusing throttle positions.